Vesicle

n.	1.	A bladderlike vessel; a membranous cavity; a cyst; a cell.
	2.	(Bot.) A small bladderlike body in the substance of a vegetable, or upon the surface of a leaf.
	3.	(Med.) A small, and more or less circular, elevation of the cuticle, containing a clear watery fluid.
	4.	(Anat.) A cavity or sac, especially one filled with fluid; as, the umbilical vesicle.
	5.	(Zool.) A small convex hollow prominence on the surface of a shell or a coral.
	6.	(Geol.) A small cavity, nearly spherical in form, and usually of the size of a pea or smaller, such as are common in some volcanic rocks. They are produced by the liberation of watery vapor in the molten mass.

Noun

1.

vesicle - a small anatomically normal sac or bladderlike structure (especially one containing fluid) Synonyms: cyst

air bubble, balloon, bilge, birthmark, blackhead, bladder, blain, bleb, blemish, blister, blob, blood blister, boss, bow, bubble, bulb, bulge, bulla, bump, bunch, burl, button, cahot, check, chine, cicatrix, clump, comedo, condyle, convex, crack, crater, craze, defacement, defect, deformation, deformity, disfiguration, disfigurement, distortion, dowel, ear, fault, fever blister, flange, flap, flaw, freckle, gall, globule, gnarl, handle, hemangioma, hickey, hill, hump, hunch, jog, joggle, keloid, kink, knob, knot, knur, knurl, lentigo, lip, loop, lump, milium, mole, mountain, needle scar, nevus, nub, nubbin, nubble, papilloma, peg, pimple, pit, pock, pockmark, port-wine mark, port-wine stain, pustule, rib, ridge, rift, ring, scab, scar, scratch, sebaceous cyst, shoulder, soap bubble, spine, split, strawberry mark, stud, sty, style, tab, track, tubercle, tubercule, twist, verruca, wale, warp, wart, weal, welt, wen, whitehead

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