Webster's English Dictionary

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capitulum

ca.pit.u.lum \k*-'pich-*-l*m\ \-l*\ n or ca.pit.u.la [NL, fr. L, small 
   head] pl  1: a rounded protuberance of an anatomical part (as a bone)  2: a 
   racemose inflorescence with the axis shortened and dilated to form a r 
   ounded or flattened cluster of sessile flowers