Webster's English Dictionary

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utricle

utri.cle \'yu:-tri-k*l\ n [L utriculus, dim. of uter leather bag] : any of 
   various small pouches or saccate parts of an animal or plant body  : as : 
   the part of the membranous labyrinth of the ear into which the semicirc 
   ular canals open : a small one-celled usu. indehiscent one-seeded or 
   few-seeded achene wit h thin membranous pericarp