Webster's English Dictionary

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duodenum

du.o.de.num \.d(y)u:-*-'de--n*m, d(y)u.-'a:d-*n-*m\ \-'de--n*, -*n-*\ n or 
   du.o.de.na or duodenums [ME, fr. ML, fr. L duodeni twelve each, fr. 
   duodecim twelve; fr. it] pl s length, about 12 fingers' breadth : the first 
   part of the small intestine extending from the pylorus to the  jejunum