Poin·set·ti·a n.  Bot. A Mexican shrub (Euphorbia pulcherrima) with very large and conspicuous vermilion bracts below the yellowish flowers.
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  Euphorbia pulcherrima
       n : tropical American plant having poisonous milk and showy
           tapering usually scarlet petallike leaves surrounding
           small yellow flowers [syn: poinsettia, Christmas star,
            Christmas flower, lobster plant, Mexican flameleaf,
            painted leaf]