basal
basal — adjective
1. lying at the deepest layer of a body tissue, especially the row of cells at the
lying at the deepest layer of a body tissue, especially the row of cells at the very bottom of the skin where new skin cells are made.
Dr. Lior explained that the basal cells of the skin keep dividing to replace older cells above them.
attributive: basal + cells
Tariq's dermatologist found early sun damage in the basal layer of her shoulder skin.
collocation: basal layer
In Ms. Park's biology class, the diagram showed basal cells dividing along the bottom of the skin.
Doctors checked the small mark on Hiro's nose for signs of basal cell carcinoma.
- superficial
medical opposite, referring to the outer skin layers
文法句型
basal + noun
用法筆記
Almost always attributive (before a noun) and tied to a small set of medical or biological collocations such as 'basal cell', 'basal layer', and 'basal cell carcinoma'. Rarely used predicatively.
常見錯誤
2. growing out of, sitting on, or shaping the lowest part of a plant, an organ, or
growing out of, sitting on, or shaping the lowest part of a plant, an organ, or a solid object — for example, leaves that come straight from the foot of the stem near the soil.
Saoirse admired the wide basal leaves spreading flat across the soil around the young oak tree.
collocation: basal leaves
The gardener trimmed the basal shoots that had grown straight from the rose bush.
collocation: basal shoots
Each spring, fresh basal stems push out around the base of Grandma's old hydrangea bush.
Paloma carefully drew the basal section of the temple column where it rested on the marble floor.
- ground-level
plain term for botanical contexts
- underlying
structural; 'basal' is more about literal position at the foot
- apical
technical opposite for plants — at the tip rather than the base
文法句型
basal + noun
用法筆記
Subject is usually a plant part, geological feature, or physical structure. Distinguish from sense 1: this sense is about the foot of a plant or object in general, while sense 1 is specifically about the deepest skin tissue.
常見錯誤
3. describing the smallest amount of activity a body needs to keep working when it
describing the smallest amount of activity a body needs to keep working when it is fully at rest — for example, the energy used for breathing and a steady heartbeat while a person lies still.
The nurse measured Ravi's basal heart rate first thing in the morning before she got out of bed.
collocation: basal heart rate
The clinic's fitness coach told Paloma that her basal metabolic rate had dropped after months of skipping breakfast.
collocation: basal metabolic rate
Every morning before sitting up, Saoirse recorded her basal body temperature on a small chart by the bed.
After the surgery, the team watched Mr. Chen's basal blood pressure for any sudden drop.
Maria's diabetes plan included a small evening dose of basal insulin to cover her body's resting needs.
- peak
highest level reached during activity, opposite of the at-rest minimum
文法句型
basal + noun
用法筆記
Frequently appears in fixed medical collocations: 'basal metabolic rate', 'basal body temperature', 'basal heart rate', 'basal insulin'. Distinguish from sense 2: here 'basal' refers to a baseline level of bodily function, not to physical position at the bottom of something.