vesicle

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vesicle

1. Pathol
a. any small sac or cavity, esp one containing serous fluid
b. a blister
2. Geology a rounded cavity within a rock formed during solidification by expansion of the gases present in the magma
3. Botany a small bladder-like cavity occurring in certain seaweeds and aquatic plants

vesicle

[′ves·ə·kəl]
(biology)
A small, thin-walled bladderlike cavity, usually filled with fluid.
(geology)
A cavity in lava formed by entrapment of a gas bubble during solidification. Also known as air sac; bladder; saccus; vacuole; wing.