stem
stem — abbreviation
1. a short label for the group of subjects covering science and technology along wi
a short label for the group of subjects covering science and technology along with engineering and mathematics, which many governments and schools treat as a priority academic area.
The school is adding more STEM classes to help students learn coding and robotics.
collocation: STEM classes / STEM subjects / STEM education
Élise chose a career in STEM because she loved chemistry and electronics.
Many colleges offer scholarships specifically for women in STEM fields.
The government put more money into STEM programs in primary and secondary schools.
用法筆記
STEM is written in capital letters and treated as a singular noun. It is not used for individual subjects — you would say 'a science class,' not 'a STEM class,' for a single discipline.
常見錯誤
stem — noun
1. the essential or foundational portion of something, which other elements grow ou
the essential or foundational portion of something, which other elements grow out of or rely on for structure and support.
The stem of the problem is that nobody trusts the management anymore.
metaphorical use with 'problem'
These disagreements all come from the same stem — a lack of clear rules.
The argument forms the stem of the entire novel, giving it a clear direction.
Folake sees her family as the stem that holds everything in her life together.
用法筆記
This is a figurative extension of the plant sense. It often appears with 'the stem of' followed by an abstract noun (problem, argument, issue).
2. the long, thin central stalk growing from the ground that holds the leaves, flow
the long, thin central stalk growing from the ground that holds the leaves, flowers, or fruit of a plant upright.
The rose has a long green stem with sharp thorns along it.
collocation: long green stem
Caio cut the flower stem at an angle before putting it in water.
Snails ate the stems of the young tomato plants in the garden.
A strong wind bent the sunflower stem but did not break it.
Lakshmi tied the bean plant stems to wooden sticks so they would grow straight.
常見錯誤
3. the slender upright section found on wine glasses, rising from the flat base up
the slender upright section found on wine glasses, rising from the flat base up to the wide top that holds the drink.
Maja held the wine glass carefully by the stem to avoid warming the bowl.
hold [object] by the stem
A crack appeared in the glass stem and the whole thing broke apart.
The crystal goblet has a beautifully twisted stem in the middle.
Hugo snapped the stem off the champagne flute while washing it.
用法筆記
This sense is mostly used for formal or special drinking glasses (wine glasses, goblets), not for everyday cups or mugs.
4. in grammar, the portion left after stripping off all prefixes and suffixes; this
in grammar, the portion left after stripping off all prefixes and suffixes; this portion stays constant when grammatical endings are attached.
The stem of 'running' is 'run', which stays the same in 'ran' and 'runner'.
stem of [word] is [base form]
Linguists study how a word stem changes when different endings are added to it.
In the word 'unhappily', the stem is 'happy' after removing 'un-' and '-ly'.
Yan learned that 'walk' is the stem for 'walks', 'walked', and 'walking' in English.
用法筆記
In grammar teaching, 'stem' and 'root' are sometimes used as synonyms. However, a stem can include affixes while a root cannot — 'nation' is the root of 'national,' but 'national' is the stem of 'nationalize.'
5. the small knob found on a watch or clock casing; users twist it to adjust the ha
the small knob found on a watch or clock casing; users twist it to adjust the hands or wind the internal mechanism.
Shirin pulled the watch stem out and turned it gently to set the correct time.
pull out the stem of [a watch]
The repair shop replaced the broken stem so the old pocket watch would work again.
Ilan pushed the stem back in after winding the clock to start it ticking.
If the stem feels loose, the watch may need a new crown or gear inside.
- crown
the more common term among watch users; 'stem' is the technical name used by watchmakers
- winding knob
descriptive term, less technical
用法筆記
This sense is also called the 'crown' or 'winding stem' in horology. It appears mainly in repair manuals, watch descriptions, and hobbyist contexts.
6. the heavy vertical beam at a vessel's bow that pushes through oncoming water and
the heavy vertical beam at a vessel's bow that pushes through oncoming water and provides support for the front of the hull.
The ship's stem was reinforced with steel plates after the collision with ice.
passive: stem reinforced with [material]
Jack stood at the fishing boat's stem, watching for hidden rocks in the water.
at the stem of [a vessel]
Paint on the old wooden stem had peeled off from years of salt water.
The design of the stem determines how smoothly a ship moves through waves.
- stern
the back end of a ship
用法筆記
This is a nautical term. It is found in shipbuilding, sailing, and naval contexts. The opposite end of the ship is the stern. The idiom 'from stem to stern' means 'from the front to the back of a ship' or, more loosely, 'completely.'
常見錯誤
7. the academic grouping of four disciplines—engineering alongside science, technol
the academic grouping of four disciplines—engineering alongside science, technology, and mathematics—studied as a combined field at schools and universities.
Apinya decided to study STEM at university because she wants to design bridges.
study STEM at [institution]
Girls in the program built robots and learned how STEM can solve everyday problems.
The university invested in a new STEM centre with modern computer labs and workshops.
Stephanie says her love of STEM began after dismantling an old radio as a child.
用法筆記
This is the noun use of the abbreviation STEM, referring to the collective academic field. When written as a noun (not an abbreviation label), it is still capitalised. It is uncountable: 'STEM is growing,' not 'STEMs are growing.'
常見錯誤
8. on a smoking pipe, the narrow piece connecting the bowl to the mouthpiece, throu
on a smoking pipe, the narrow piece connecting the bowl to the mouthpiece, through which the user inhales the smoke.
Kian cleaned the pipe stem with a thin wire to remove the built-up tar inside.
clean the pipe stem
The wooden stem of the old pipe had cracked from years of use and heat.
A collector judges a pipe by how smooth the stem and mouthpiece feel.
Yan carefully fitted a new stem onto the antique pipe he was repairing.
用法筆記
This sense is limited to tobacco pipe enthusiasts and vintage contexts. Most modern learners will encounter this in literature rather than daily conversation.
stem — verb
1. to stop or slow down the development, spread, or increase of something that is c
to stop or slow down the development, spread, or increase of something that is considered bad or harmful.
The new policy aims to stem the loss of young teachers from rural schools.
stem the loss of [something]
Doctors are trying to stem the rise of antibiotic-resistant infections in hospitals.
The government introduced measures to stem the flow of illegal goods across the border.
Social media companies took steps to stem the spread of false news during the election.
- promote
to actively encourage growth or spread
- accelerate
to cause something to happen faster
文法句型
stem + noun phrase (something unwanted)
用法筆記
This sense is formal and often used in news, policy, and academic writing. Frequent objects are 'tide,' 'flow,' 'loss,' 'rise,' 'spread,' and 'wave.' It is almost never used with small, everyday situations (e.g., you would not 'stem a child's crying').
常見錯誤
2. to halt a liquid from continuing to move, especially blood escaping from an inju
to halt a liquid from continuing to move, especially blood escaping from an injury, by pressing on the source or using medical techniques.
The nurse pressed a cloth against the cut to stem the flow of blood.
stem the flow of blood
It took several minutes for the doctor to stem the bleeding from the deep wound.
stem the bleeding
Folake used a clean towel to stem the blood until the ambulance arrived.
The surgeon managed to stem the internal bleeding with a tiny clamp.
文法句型
stem + noun phrase (the liquid or the source)
用法筆記
This sense is most commonly used in medical and first-aid contexts. The object is usually 'blood,' 'bleeding,' or 'the flow of blood.' For other liquids (e.g., water from a pipe), 'stop' or 'block' is more common.
常見錯誤
3. to develop or happen as a result of something else; to have a particular cause,
to develop or happen as a result of something else; to have a particular cause, origin, or starting point.
Her fear of dogs stems from a childhood incident with a large, excited dog.
stem from + noun phrase (origin / cause)
Many of the team's problems stem from poor communication between departments.
Jack's interest in cooking stems from helping his grandmother in the kitchen every weekend.
The disagreement stems from a misunderstanding about who was supposed to pay the bill.
- originate
more formal; can be used for both physical and abstract sources
- arise from
suggests something emerges as a consequence; slightly more formal
- come from
more casual and common in everyday speech
- result in
reverses the direction of causation (A stems from B = B results in A)
文法句型
stem from + noun phrase
stem from + -ing form
用法筆記
Always used with 'from' (or occasionally 'in'). The construction 'stem from the fact that…' is common in academic writing. This verb is not used for physical objects — you would not say 'the river stems from the mountains' (use 'originates').
常見錯誤
4. to remove the thin stalk or stem from a fruit, vegetable, or leaf before cooking
to remove the thin stalk or stem from a fruit, vegetable, or leaf before cooking or eating it.
Hugo stemmed the strawberries before adding them to the cake batter.
stem + [fruit] before [cooking action]
The recipe says to stem the herbs and chop the leaves very finely.
Apinya sat at the table stemming a large bowl of grapes for the fruit salad.
If you stem the spinach first, the cooked dish will have a softer texture.
文法句型
stem + noun phrase (fruit / vegetable)
用法筆記
This is a kitchen or gardening verb. The object is always the plant or fruit, not the stem itself (e.g., 'stem the strawberries,' not 'stem the stems'). In recipes, 'destem' is sometimes used interchangeably.