| 单词 | base |
| 释义 | base 1. n. & v. --n 1. a a part that supports from beneath or serves as a foundation for an object or structure. b a notional structure or entity on which something draws or depends (power base). 2. a principle or starting-point; a basis. 3. esp. Mil. a place from which an operation or activity is directed. 4. a a main or important ingredient of a mixture. b a substance, e.g. water, in combination with which pigment forms paint etc. 5. a substance used as a foundation for make-up. 6. Chem. a substance capable of combining with an acid to form a salt and water and usu. producing hydroxide ions when dissolved in water. 7. Math. a number in terms of which other numbers or logarithms are expressed (see RADIX). 8. Archit. the part of a column between the shaft and pedestal or pavement. 9. Geom. a line or surface on which a figure is regarded as standing. 10. Surveying a known line used as a geometrical base for trigonometry. 11. Electronics the middle part of a transistor separating the emitter from the collector. 12. Linguistics a root or stem as the origin of a word or a derivative. 13. Baseball etc. one of the four stations that must be reached in turn when scoring a run. 14. Bot. & Zool. the end at which an organ is attached to the trunk. 15. Heraldry the lowest part of a shield. --vtr. 1. (usu. foll. by on, upon) found or establish (a theory based on speculation; his opinion was soundly based). 2. (foll. by at, in, etc.) station (troops were based in Malta). Phrases and idioms base hospital esp. Austral. a hospital in a rural area, or (in warfare) removed from the field of action. base pairing Biochem. complementary binding by means of hydrogen bonds of a purine to a pyrimidine base in opposite strands of nucleic acids. base rate Brit. the interest rate set by the Bank of England, used as the basis for other banks' rates. base unit a unit that is defined arbitrarily and not by combinations of other units. Etymology: F base or L basis stepping f. Gk 2. adj. 1. lacking moral worth; cowardly, despicable. 2. menial. 3. not pure; alloyed (base coin). 4. (of a metal) low in value (opp. NOBLE, PRECIOUS). Derivatives basely adv. baseness n. Etymology: ME in sense 'of small height', f. F bas f. med.L bassus short (in L as a cognomen) |
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