A bladder-like structure more than 5 mm in diameter with thin walls that may be full of fluid. Also called a bulla.
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1. A large flaccid vesicle. 2. An acquired lung cyst, usually less than 1 cm in diameter, similar to but smaller than a bulla, which is thought to be the most common cause of spontaneous pneumothorax. Blebs occur mainly in the apex of the lung.
- filtering b. a blister of conjunctiva resulting from glaucoma surgery by which a flap of sclera is created in the eye wall, allowing aqueous humor to percolate out of the eye and underneath the conjunctiva, thus lowering intraocular pressure. SYN: filtering cicatrix.
- pulmonary b. air-filled alveolar dilation less than 1 cm in diameter on the edge of the lung at the apex of upper lobe or superior segment of lower lobe; usually occurs in young people and can rupture, producing primary pneumothorax. Cf.:pulmonary bulla.

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bleb 'bleb n
1) a small blister compare BULLA (2)
2) something resembling a bleb esp a vesicular outpocketing of a plasma or nuclear membrane
bleb·bing -iŋ n
bleb·by 'bleb-ē adj

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a blister or large vesicle. A filtering bleb is a blister-like cyst underneath the conjunctiva resulting from trabeculectomy, a surgical procedure commonly used in the treatment of glaucoma.

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(bleb) bulla (def. 1).

Medical dictionary. 2011.


Look at other dictionaries:

  • 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.… …   The Collaborative International Dictionary of English

  • bleb — bleb; bleb·bing; bleb·by; …   English syllables

  • bleb — /blɛb/ (say bleb) noun Rare 1. a blister or pustule. 2. a bubble. {? variant of blob} –blebby, adjective …   Australian English dictionary

  • bleb — [bleb] n. [echoic: to represent the sound produced in forming a bubble with the lips] 1. a small swelling under the skin; a blister or vesicle 2. an air bubble, as in water or glass blebby adj …   English World dictionary

  • bleb — (n.) c.1600, blister or swelling, imitative. Also used for bubble (1640s), protuberance on a cell surface (1962) …   Etymology dictionary

  • bleb|by — «BLEHB ee», adjective. full of blebs …   Useful english dictionary

  • Bleb — For the protrusion of cell membrane present during apoptosis and cell motility, please see Bleb (cell biology). In medicine, bleb is a large blister (usually approximately hemispherical) filled with serous fluid. Blebs can form in a number of… …   Wikipedia

  • bleb — 1. noun /blɛb/ a) A bubble, such as in paint or glass b) A large vesicle or bulla, usually containing a serous fluid Syn: blister, bubble 2 …   Wiktionary

  • bleb — [[t]blɛb[/t]] n. 1) med a blister or vesicle 2) a bubble • Etymology: 1600–10 bleb′by, adj …   From formal English to slang

  • bleb — noun Etymology: perhaps alteration of blob Date: 1607 1. a small blister 2. bubble; also a small particle 3. something resembling a bleb; especially a vesicular …   New Collegiate Dictionary

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