biennial的词源

英文词源

biennial (adj.)

"lasting for two years" (1620s); "occurring every two years" (1750), from Latin biennium "two-year period," from bi- (see bi-) + annus "year" (see annual). The vowel change is "due to the Latin phonetic law according to which the unaccented and closed radical syllable of the second element of compounds, original -ă- becomes -ĕ-" [Klein]. The noun meaning "a biennial plant" is attested by 1770.

中文词源

biennial：两年一次的

前缀bi-, 二。词根enn, 年。

该词的英语词源请访问趣词词源英文版：biennial 词源，biennial 含义。

biennial：(事件)两年一次的

词根词缀： bi-两,二 + enn(-ann-)年 + -ial形容词词尾