pentadn.
英 'pentæd | 美 'pɛntæd
中文n. 五；五个一组；五年间；五价物
词根词源
pentad (n.)1650s, from Greek pentas (genitive pentados) "group of five" (see five). Meaning "period of five years" is from 1880; meaning "period of five days" is from 1906, originally in meteorology.
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