Webster's English Dictionary

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centrosome

cen.tro.some \'sen-tr*-.so-m\ \.sen-tr*-'so--mik\ n [G zentrosom, fr. 
   zentr- centr- + -som -some] 1: a minute protoplasmic body sometimes held to 
   be the dynamic center of mi totic activity 2: CENTRIOLE  - cen.tro.so.mic 
   aj