Webster's English Dictionary

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watermelon

wa.ter.mel.on \-.mel-*n\ n 1: a large oblong or roundish fruit with a hard 
   green or white rind often s triped or variegated, a sweet watery pink, 
   yellowish, or red pulp, and many seeds 2: a widely grown African vine 
   (Citrullus vulgaris) of the gourd fami ly whose fruits are watermelons