BLEB

bleb. Bleb, n. a small cavity in a substance

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Bleb (�), n. [[Prov. E. bleb, bleib, blob, bubble, blister. This word belongs to the root of blub, blubber, blabber, and perh. blow to puff.]] A large vesicle or bulla, usually containing a serous fluid; a blister; a bubble, as in water, glass, etc. Arsenic abounds with air blebs. Kirwan.