Webster's English Dictionary

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hilum

hi.lum \'hi--l*m\ \-l*\ n or hi.la [NL, fr. L, trifle] pl  1a: a scar on a 
   seed (as a bean) marking the point of attachment of the ovu le 1b: the 
   nucleus of a starch grain  2: a notch in or opening from a bodily part 
   suggesting the hilum of a bean