Webster's English Dictionary

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chromosome

chro.mo.some \'kro--m*-.so-m\ \.kro--m*-'so--mik\ n [ISV] : one of the usu. 
   elongated chromatin-containing basophilic bodies of the  cell nucleus made 
   up of chromatids and usu. constant in number in the cells of any one kind 
   of plant or animal - chro.mo.so.mic aj