biennial是什么意思(biennial的用法)
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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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