tetrad
n.
"the number four, collection of four things," 1650s, from Greek tetras (comb. form tetrad-) "group of four, number four" (see tetra-).
〔李〕n. 四个一组 [tetr =four] ←-ad 1[GK] 表示“集合”的概念
〔李〕n. 四个一组 [tetr =four] ←-ad 1[GK] 表示“集合”的概念
| 词汇 | tetrad |
| 词根词缀 | Online Etymology Dictionary 词根李平武蒋争 tetrad n. "the number four, collection of four things," 1650s, from Greek tetras (comb. form tetrad-) "group of four, number four" (see tetra-). 〔李〕n. 四个一组 [tetr =four] ←-ad 1[GK] 表示“集合”的概念 |
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