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From The Collaborative International Dictionary of English v.0.48:
Bleb \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. [1913 Webster] Arsenic abounds with air blebs. --Kirwan. [1913 Webster]