smear

to spread or daub (an oily, greasy, viscous, or wet substance) on or over something: to smear butter on bread. to spread or daub an oily, greasy, viscous, or wet substance on: to smear bread with butter.

4 ink/paint [intransitive, transitive] if writing, a picture, or paint smears or is smeared, the ink or paint is accidentally touched and spread across the surface SYN smudge Several words were smeared.

to stain, spot, or make dirty with something oily, greasy, viscous, or wet.

Examples from Collins dictionaries My sister smeared herself with suntan oil and slept by the swimming pool. Smear a little olive oil over the inside of the salad bowl. There was a smear of gravy on his chin. He puts all the accusations down to a smear campaign by his political opponents.

A smear test is the older name for the test. It was called that because of the way the test used to be done – cells were smeared on a glass slide, which was sent to the laboratory for testing. The test is different now and most healthcare professionals call it cervical screening.

a mark or flaw that spoils the appearance of something (especially on a person's body) an act that brings discredit to the person who does it. “he made a huge blot on his copybook” synonyms: smear, smirch, spot, stain.

​[transitive] to spread an oily or soft substance over a surface in a rough or careless way synonym daub. smear something on/over something The children had smeared mud on the walls.

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Overview

• A thick blood smear is a drop of blood on a glass slide. Thick blood smears are most useful for detecting the presence of parasites, because they examine a larger sample of blood.
• A thin blood smear is a drop of blood that is spread across a large area of the slide.

Smear slides are used to determine the composition of sediment recovered during coring. The technique is also known as smear slide petrography. It is like exploring a new world under the microscope. A smear slide [Credit: Shubham Tripathi] To make a smear slide, I take a small amount of sediment on a toothpick.

Culture from solid media: Using a sterile pipette, add one drop of sterile saline or sterile water to the center of the microscope slide. Aseptically pick a small amount of an isolated colony with a loop and gently mix into the drop of sterile saline or water using circular motions. Mix evenly to make a thin smear.

“German smear is a masonry technique that involves applying a thin coat of mortar onto the surface of brick or stone and then smearing it off, leaving behind a textured and whitewashed appearance,” Alonzo Perez of Garland, Texas-based Alexander and Xavier Masonry.