biennial can be used as a adj
1. biennial, two-year -- (having a life cycle lasting two seasons; "a biennial life cycle"; "parsnips and carrots are biennial plants often grown as annuals")
2. biennial, biyearly -- (occurring every second year; "they met at biennial conventions")
biennial can be used as a noun
1. biennial -- ((botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season)
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