| 单词 | tetrad |
| 释义 | tetrad /te"trad/, n. 1. a group of four. 2. the number four. 3. Cell Biol. a group of four chromatids formed by synapsis at the beginning of meiosis. 4. Chem. a tetravalent or quadrivalent element, atom, or group. [1645-55; < Gk tetrad- (s. of tetrás) group of four] |
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