| 单词 | beta |
| 释义 | beta n. 1. the second letter of the Greek alphabet (B, {szlig}). 2. a second-class mark given for a piece of work or in an examination. 3. Astron. the second brightest star in a constellation. 4. the second member of a series. Phrases and idioms beta-blocker Pharm. a drug that prevents the stimulation of increased cardiac action, used to treat angina and reduce high blood pressure. beta particle (or ray) a fast-moving electron emitted by radioactive decay of substances (orig. regarded as rays). Etymology: ME f. L f. Gk |
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