chiefly nocturnal predacious arthropod having a flattened body of 15 to 173 segments each with a pair of legs the foremost being modified into poison fangs
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
having a life cycle lasting two seasons; "a biennial life cycle"; "parsnips and carrots are biennial plants often grown as annuals"
occurring every second year; "they met at biennial conventions"