smear

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smear

 [smēr]
a specimen for microscopic study, the material being spread thinly and unevenly across the slide with a swab or loop, or with the edge of another slide.
Smears from opaque thick liquids or semisolids, such as stool, can be made using a swab to sample and smear the material. From Mahon and Manuselis, 1995.
Pap smear (Papanicolaou smear) see papanicolaou test.

smear

(smēr),
A thin specimen for examination; it is usually prepared by spreading material uniformly onto a glass slide, fixing it, and staining it before examination.

smear

(smēr) a specimen for microscopic study prepared by spreading the material across the slide.
Pap smear , Papanicolaou smear see under test.

smear

(smîr)
n.
Biology A sample, as of blood or bacterial cells, spread on a slide for microscopic examination or on the surface of a culture medium.

smear

Etymology: AS, smeoru, grease
a laboratory specimen for microscopic examination prepared by spreading a thin film of tissue or fluid on a glass slide. A dye, stain, reagent, diluent, or lysing agent may be applied to the specimen, depending on the purpose of the examination.

smear

Tuberculosis A specimen gobbed on a glass slide, stained, washed in an acid solution, and examined by LM to detect AFB in a specimen. See Acid-fast bacilli, Wet mount.

smear

(smēr)
A thin specimen for microscopic examination; usually prepared by spreading liquid or semisolid material uniformly onto a glass slide, fixing it, and staining it before examination.

smear

(smer) [Old English. smerian, to anoint]
1. In bacteriology, material spread on a surface, as a microscopic slide or a culture medium.
2. Material obtained from infected matter spread over solid culture media.
3. Cellular material obtained from a body structure by swabbing, gently scraping, or scratching.
Enlarge picture
PREPARATION OF BLOOD SMEAR
Enlarge picture
PREPARATION OF BLOOD SMEAR

blood smear

A drop of (anticoagulated) whole blood spread thinly on a glass microscope slide so that blood cell types can be examined, counted, and characterized. Synonym: peripheral blood smear

Procedure: The slide must be grease-free. It is cleaned with alcohol, rinsed in warm water, and wiped clean with a lint-free towel or lens paper.A small drop of blood is placed on the slide; the end of another slide (spreader slide) is placed against the first slide at a 45° angle and pulled back against the drop of blood so that the drop spreads between the point of contact of the two slides. Then the spreader slide is pushed forward against the first slide; the blood will form an even, thin smear. The slide is dried by waving it in the air; it should not be heated. The blood smear is covered with Wright's stain and allowed to stand 2 min. An equal amount of distilled water or buffer solution is added and mixed uniformly. It is allowed to stand 5 min. The stain is gently washed off and the slide is allowed to dry.

See: illustrationillustration

buccal smear

A sample of cells taken from the mucosa lining the cheek for chromosomal or other studies.

Pap smear

Papanicolaou test.

peripheral blood smear

Synonym: blood smear

smear

A thin film of tissue, cells, blood or other material spread on a transparent slide for microscopic examination.

Smear

A specimen prepared for microscopic study by spreading the material across a slide and treating it with a specific stain.
Mentioned in: Leprosy

smear

(smēr)
Thin specimen for examination; usually prepared by spreading material uniformly onto a glass slide, fixing it, and staining it before examination.

smear

a specimen for microscopic study, the material being spread thinly and unevenly across the slide with a swab or loop, or with the edge of another slide, e.g. blood smear, for differential white cell count, or trypanosome sighting, fecal for the presence of worm eggs or coccidial oocysts.

impression smear
one made by pressing the slide against tissue, usually the surface of a neoplasm or the cut surface of a tissue specimen.
References in periodicals archive ?
It's gummy and smeary, yet as abrasive to carbide as a honing stone.
I have never seen people behave in this way - personal, nasty, smeary, made-up stories.
A good one can make you look like you live a blameless, carefree life and a bad one can make you look like you lost a scrap with some smeary pan stick.
The mascarpone on the Piccante wasn't pleasant, smeary, sweet.
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And yet, though of all in this city I've ever known the most eloquent (The new self with which all finely made love should provide you is as wide as the mind is, and musicked deep with feeling, he has said, giving me a surefire line for the ladies which I will use henceforward), he is still, I feel, in his heart of hearts, a country boy, one who can speak of nature turning its dumb face to us like a cow or of night coming down like the shutter of a shop, can compare thought to a stack of smeary plates, his dear wife's breasts when she's on her back to hot pies, the moment of departing this life to the airy rocking of an empty swing.
A clean screen can be turned into a smeary mess in seconds, particularly on a motorway after heavy rainfall.
In winter you don't get smeary masses of colour, but precise detail.
Against the drabness of the walls, the wet and smeary windows and murky November light, there seemed to be living color and form in paintings and art objects.