ed
ed — noun
1. a short written form of 'education', used mostly as part of program and course t
a short written form of 'education', used mostly as part of program and course titles — for example, in phrases like 'adult ed' or 'continuing ed'.
Bao signed up for an adult ed class to prepare for the citizenship test.
collocation: adult ed / continuing ed
The university offers a popular continuing ed certificate in digital marketing.
Several teachers from the high school took a special ed course on inclusive classroom techniques.
A flyer for a community ed yoga class appeared in everyone's mailbox last week.
文法句型
ed (uncountable noun) — usually in compound course names
用法筆記
This abbreviation appears almost exclusively as the second part of a compound course name (adult ed, special ed, continuing ed). It is not used as a standalone replacement for the full word 'education' in general writing.
常見錯誤
2. a short spoken or written form of 'editor', referring to a person who decides wh
a short spoken or written form of 'editor', referring to a person who decides what goes into a newspaper, magazine, or a section of one — used especially within the publishing industry or in informal workplace speech.
Christopher, the city ed, approved the front-page story just before midnight.
used as a job-title compound: city ed
Kasia landed a job as the fashion ed for a popular lifestyle magazine in Taipei.
The sports ed asked one of the junior reporters to cover the championship match.
Wren showed the draft to the photo ed, who suggested different images for the spread.
- editor
the full form, used in all registers; 'ed' is an informal shorthand
文法句型
ed (countable noun) — used as a job title
用法筆記
Used mostly as a job-title compound (city ed, fashion ed, sports ed) within media workplaces. In formal writing the full form 'editor' is preferred.
常見錯誤
3. short for 'emergency department': a hospital unit that handles urgent medical ca
short for 'emergency department': a hospital unit that handles urgent medical cases around the clock, without requiring advance booking.
Paramedics rushed the injured cyclist to the ED at Queen Mary Hospital.
preceded by 'the': the ED
The ED was unusually quiet on Tuesday night, with only three patients waiting.
Liang spent four hours in the ED waiting room before a doctor examined his wrist.
Hospitals in the region reported that ED visits for flu complications doubled in January.
- emergency room
more common in American English; refers to the treatment area rather than the whole department
- A&E
British English equivalent; stands for 'accident and emergency'
文法句型
the ED (noun phrase) — often preceded by 'the'
用法筆記
In speech the abbreviation is pronounced as individual letters ('E-D'). In British English the equivalent term is 'A&E' (accident and emergency). In American English 'ER' (emergency room) is also common but refers more narrowly to the treatment room itself rather than the whole department.
常見錯誤
4. short for 'eating disorder': a psychiatric condition marked by severely unhealth
short for 'eating disorder': a psychiatric condition marked by severely unhealthy eating patterns — for example, eating too little, too much, or in a highly controlled way — often linked to emotional distress.
Defne has received treatment for ED at a clinic for the past six months.
ED as an uncountable condition: treatment for ED
The documentary explored how social media can contribute to the development of ED in teenagers.
The hospital started a support group for young adults recovering from ED.
Doctors stress that ED is a medical condition, not a lifestyle choice.
- eating disorder
the full form; preferred in clinical and formal contexts
文法句型
ED (noun) — used as an uncountable condition name or a countable diagnosis
用法筆記
In clinical and journalistic contexts the full term 'eating disorder' is preferred on first mention, with 'ED' used afterward. The abbreviation is pronounced as individual letters ('E-D').
常見錯誤
5. short for 'erectile dysfunction': a medical condition in which a man finds it di
short for 'erectile dysfunction': a medical condition in which a man finds it difficult to get or sustain an erection firm enough for sexual intercourse.
After his check-up, Esteban discussed treatment options for his ED with the urologist.
ED as a medical condition: treatment options for ED
The advertisement listed several prescription drugs that claim to help men with ED.
Obi read that regular exercise can lower the risk of developing ED later in life.
Many men feel embarrassed to bring up ED during a routine doctor's appointment.
- erectile dysfunction
the full medical term; 'ED' is the clinical abbreviation
文法句型
ED (uncountable noun) — used as a medical condition name
用法筆記
In medical and pharmaceutical contexts this abbreviation is standard and widely recognized. In everyday conversation the full term 'erectile dysfunction' or simpler phrases ('trouble getting an erection') are more common.
常見錯誤
6. short for 'effective dose': the dosage of a medicine that achieves the intended
short for 'effective dose': the dosage of a medicine that achieves the intended therapeutic effect in a patient or during laboratory testing.
The ED of the experimental drug was 50 mg per kilogram in clinical trials.
ED qualified by a specific value: ED of 50 mg/kg
Researchers established the ED range for the new vaccine during the phase-two study.
The ED values varied significantly between the animal model and the human subjects.
Pharmacologists call ED50 the dose that works for half of a test group.
- effective dose
the full form; preferred in general medical writing
- toxic dose
the amount that causes harmful effects
文法句型
ED (noun) — usually qualified by a numeral or range
用法筆記
Almost exclusively used in pharmacology and clinical research writing. The abbreviation is often followed by a subscript number (ED50, ED90) indicating the percentage of the population that responds. Not used in general conversation.
7. a written abbreviation for 'editor' or 'edited', used in citations and bibliogra
a written abbreviation for 'editor' or 'edited', used in citations and bibliographies to indicate the person who prepared a book or text for publication — appearing before or after the editor's name.
In the bibliography, 'Smith, J., ed.' means John Smith edited the collection of essays.
position: ed. after the name
Gita cited the handbook as 'Okafor, K., ed., *Guide to Urban Planning* (2022).'
The footnote read 'Wren, Élise, ed. *Modernist Poetry: An Anthology* (2020).'
When the source has multiple editors, the abbreviation 'eds.' is used instead of 'ed.'
文法句型
ed. (abbreviation) — used in bibliographic citations
用法筆記
Always written with a period (ed.) in formal citations. The plural form is 'eds.' for two or more editors. In APA, MLA, and Chicago styles the abbreviation is standard in reference lists but the full form may be used in the main text.
常見錯誤
❌ Using 'ed.' when there are multiple editors (should be 'eds.')
8. a written abbreviation for 'edition', used after a number (2nd, 3rd, etc.) in ci
a written abbreviation for 'edition', used after a number (2nd, 3rd, etc.) in citations and bibliographies to specify which version of a book or text is being referred to.
The professor told students to use the 5th ed. of the handbook for their papers.
numeral + ed.: 5th ed.
Adina compared the first and second ed. of the dictionary to see changes.
The library has both the 3rd ed. and the revised 4th ed. of the encyclopedia.
In the style guide, '2nd ed.' goes after the title and before the publisher's name.
文法句型
[number] + ed. (abbreviation) — used after a number to indicate a specific edition
用法筆記
Always written with a period (ed.) in formal citations. Unlike 'editor' (sense 7), 'edition' follows a number — '2nd ed.', 'rev. ed.' (revised edition). This distinction helps the reader tell the two abbreviations apart in a reference list.