Etymology
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bleb (n.)

c. 1600, "blister or swelling," imitative. Also used for "bubble" (1640s), "protuberance on a cell surface" (1962). Compare blob. "In relation to blob, bleb expresses a smaller swelling" [OED].

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Definitions of bleb

bleb (n.)
(pathology) an elevation of the skin filled with serous fluid;
Synonyms: blister / bulla
From wordnet.princeton.edu