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Definition of bleb : A large vesicle or bulla, usually containing a serous fluid; a blister; a bubble, as in water, glass, etc.

Synonyms:

blister, bulla

Usage examples:

• The Cross Roads; or, The Haymaker's Story Stopt by the storm, that long in sullen black From the south- west stained its encroaching track, Haymakers, hustling from the rain to hide, Sought the grey willows by the pasture- side; And there, while big drops bow the grassy stems, And bleb the withering hay with pearly gems, Dimple the brook, and patter in the leaves, The song or tale an hour's restraint relieves. - "Poems Chiefly From Manuscript", John Clare.
• If this is done carefully, the drawn- out portion can be separated off, leaving only a slight " bleb" on the portion it is desired to seal. - "A Handbook of Laboratory Glass-Blowing", Bernard D. Bolas.
• 4., into the ordinary form of test- tube seal, it is only necessary to heat the " bleb" a little more strongly, blow gently into the tube until the thick portion is slightly expanded, re- heat the whole of the rounded end until it is beginning to collapse, and give a final shaping by careful blowing after it has commenced to cool. - "A Handbook of Laboratory Glass-Blowing", Bernard D. Bolas.