Webster's English Dictionary

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pyxidium

pyx.id.i.um \pik-'sid-e--*m\ \-e--*\ n or pyx.id.ia [NL, fr. Gk pysicion, 
   dim. of pyxis] pl  1: a capsular fruit that dehisces so that the upper part 
   falls off like a c ap 2: CAPSULE