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vesicle

noun

1. a small sac or cyst containing fluid or gas

2. (cell biology) a bubble-like membranous structure that stores and transports cellular products, and digests metabolic wastes within the cell; an intracellular membranous sac that is separated from the cytosol by at least one lipid bilayer

3. (physiology) a membranous pouch within an axon terminal that stores and releases neurotransmitter

4. (pathology) small fluid-filled lesion or blister formed in or beneath the skin

5. (mycology) in fungi, a bubble-like sac produced by zoosporangium, and from where zoospores mature and are eventually released

6. (phycology) a floating gas-filled bubble or bladder-like structure in algal cell

word origin: from Latin vēsīcula, diminutive of vēsīca, bladder, blister