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|Noun||1.||genus Trapa - small genus of Eurasian aquatic perennial herbs: water chestnut|
dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination
family Trapaceae, Trapaceae - family comprising solely the genus Trapa; in some classifications treated as a subfamily or tribe of the family Onagraceae