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Definition of: vesicle
(ves′i·kəl) noun
1. Any small bladderlike cavity, cell, or cyst.
2. A small sac, containing gas or fluid.
3. Pathol. Any small rounded elevation of the cuticle containing a clear liquid; a blister.
4. Bot. A small bladderlike cavity filled with air.
5. Geol. A small spherical cavity found commonly in volcanic rocks. [<L vesicula, dim. of vesica a bladder]
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