Utricle /(?)/

U·tri·cle

Utricle

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