From The Collaborative International Dictionary of English v.0.48:

Utricle \U"tri*cle\, n. [L. utriculus a little womb, a calycle,
   dim. of uter, utris, a bag or bottle made of an animal's
   hide: cf. F. utricule.]
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   1. A little sac or vesicle, as the air cell of fucus, or
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   2. (Physiol.) A microscopic cell in the structure of an egg,
      animal, or plant.
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   3. (Bot.) A small, thin-walled, one-seeded fruit, as of
      goosefoot. --Gray.
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   4. (Anat.) A utriculus.
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