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.]

1. A little sac or vesicle, as the air cell of fucus, or seaweed.

2. (Physiol.) A microscopic cell in the structure of an egg, animal, or plant.

3. (Bot.) A small, thin-walled, one-seeded fruit, as of goosefoot. --Gray.

4. (Anat.) A utriculus.

Source: Webster's Revised Unabridged Dictionary (1913)