buffy coat

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noun Biochemistry.

a yellowish-white layer consisting of leukocytes that, upon centrifugation of blood, covers the red blood cells.

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Origin of buffy coat

First recorded in 1790–1800

He wore white gloves, a dignified long black coat, and matching pants and vest, and he carried a dark walking stick.
The Black Man Who Replaced Jefferson Davis in the Senate|Philip Dray|January 7, 2015|DAILY BEAST
Place the thinly sliced shallots in a medium bowl and pour buttermilk over to coat.
Make Carla Hall’s Crispy Shallot Green Bean Casserole|Carla Hall|December 27, 2014|DAILY BEAST
The man finally manages to break free with the help of the others, slipping out of his coat.
Protesters Slimed This Good Samaritan Cop|Michael Daly|December 16, 2014|DAILY BEAST
Micah is 10 years old and he had a coat geared to the season, a Patagonia winter jacket with a hood.
The Wildly Peaceful, Human, Almost Boring, Ultimately Great New York City Protests for Eric Garner|Mike Barnicle|December 8, 2014|DAILY BEAST

He tore a piece of meat off the breast and stroked her coat while she ate.
The Stacks: A Chicken Dinner That Mends Your Heart|Pete Dexter|December 7, 2014|DAILY BEAST
He is rather tall and narrow, and wears a long abb's coat reaching nearly down to his feet.
Music-Study in Germany|Amy Fay
You don't mind staying here in the sunshine, I hope, while my coat dries?
The Tale of Grandfather Mole|Arthur Scott Bailey
Presently he began to shiver so, with some sort of a chill, that I took off my coat and wrapped it round him.
The Boarded-Up House|Augusta Huiell Seaman
He scratched his head in vexation, sat down, and as he did so, saw that his coat hung also upon the chair.
The Homesteader|Oscar Micheaux
I queried; and as I asked the question I noticed for the first time the gilt bars on his coat sleeve.
Raw Gold|Bertrand W. Sinclair