大家好，知识小编来为大家讲解下。biennial是什么意思，biennial的用法很多人还不知道，现在让我们一起来看看吧！

一、biennial是什么意思

1、biennial 两年一次的

2、前缀bi-, 二。词根enn, 年。

二、biennial的用法

1、biennial (adj.)

2、"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.

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