WordNet (r) 3.0 (2006):

summer squash
    n 1: any of various usually bushy plants producing fruit that is
         eaten while immature and before the rind or seeds harden
         [syn: summer squash, summer squash vine, Cucurbita
         pepo melopepo]
    2: any of various fruits of the gourd family that mature during
       the summer; eaten while immature and before seeds and rind
       harden