Webster's English Dictionary

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tumor

tu.mor or tu.mour \'t(y)u:-m*r\ \-.li-k\ \'t(y)u:m-(*-)r*s\ n [L tumor, fr. 
   tume-re] chiefly Brit  1: a swollen or distended part  2: an abnormal mass 
   of tissue that is not inflammatory, arises without obvi ous cause from 
   cells of preexistent tissue, and possesses no physiologic function - 
   tu.mor.like aj