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DictionaryRoot: clott
Old English

clott

a round mass, lump

1 / 1
A clean laboratory close-up: one clear glass test tube tilted slightly in a blue nitrile-gloved hand, holding a cohesive dark-red blood clot with a small amount of translucent straw-colored serum around it. A simple unmarked white tray lies below. The rounded gelatinous clot is unmistakably a solid mass within liquid. Non-graphic educational laboratory sample, no wound or body.
noun / verb

clot

KLAHT/klɑːt/

A thick mass formed as blood or another liquid thickens, or the forming of such a mass.

Etymology
clotOld Englisha round mass, lump

The original word meant a lump generally, not specifically thickened blood. Its application to blood and other liquids keeps that concrete image: fluid gathers into a mass instead of remaining freely flowing.

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