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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.] [1913 Webster] 1. A little sac or vesicle, as the air cell of fucus, or seaweed. [1913 Webster] 2. (Physiol.) A microscopic cell in the structure of an egg, animal, or plant. [1913 Webster] 3. (Bot.) A small, thin-walled, one-seeded fruit, as of goosefoot. --Gray. [1913 Webster] 4. (Anat.) A utriculus. [1913 Webster]