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Definitions of biennial
  1. adjective
    having a life cycle lasting two seasons
    "a biennial life cycle" "parsnips and carrots are biennial plants often grown as annuals"

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  2. adjective
    occurring every second year
    "they met at biennial conventions"
  3. noun
    (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
Definition that contains biennial
  • beet biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop
  • erysimum asperum biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; sometimes placed in genus Cheiranthus
  • white melilot biennial plant; valuable honey plant
  • hesperis biennial or perennial erect herbs having nocturnally fragrant flowers
  • onopordum acanthium biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
  • chinese forget-me-not biennial east Asian herb grown for its usually bright blue flowers
  • madnep biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip
  • genus angelica biennial or perennial herbs of the northern hemisphere; have a taproot
  • red bird's eye biennial European catchfly having red or pink flowers; sometimes placed in genus Lychnis
  • blazing star biennial of southwestern United States having white stems and toothed leaves that is grown for its large pale yellow flowers that open in early morning
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