Meaning of vesicle

ves•i•cle

Pronunciation: (ves'i-kul), [key]
— n.
  1. a small sac or cyst.
  2. a small bladderlike cavity, esp. one filled with fluid.
  3. a circumscribed elevation of the epidermis containing serous fluid; blister.
  4. a small, usually spherical cavity in a rock or mineral, formed by expansion of a gas or vapor before the enclosing body solidified.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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