biennialWiktionary 原文/baɪˈɛn.i.əl/n.两年生植物，两年一次的事adj.两年生的，两年一次的中文释义来自 ECDICT构词拆解bibi-前缀ennial-ennial后缀bi-Two in number. · Having or possessing two of the root word's quality.-ennialCombining form denoting years.词源链拉丁语Latin约前 75–公元 3 世纪biennium‘two-year period’↓ 借入英语Englishbiennial词源说明Borrowed from Latin bienni(um) (“two-year period”) [from bis, bi- (“twice”) + annus (“year”)] + -al (suffix forming adjectives). By surface analysis, bi- + -ennial.释义形容词adjective1Happening every two years.2Lasting for two years.名词noun1A plant that requires two years to complete its life-cycle, germinating and growing