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.
References in periodicals archive ?
The long slender neurites, which cross the mesoglea to innervate the sphincter muscle, contain Antho-RWamide immunoreactive granules of varying sizes, whereas the granular vesicles at synapses appear to be somewhat smaller.
In this study of gastrodermal and oral sphincter neuromuscular synapses of the sea anemone Calliactis parasitica, there are two to four or more granular vesicles aligned at paired, electron-dense, synaptic membranes separated by a 15-nm-wide cleft traversed by a series of cross filaments.