Etymology
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leukocyte (n.)

also leucocyte, "white blood cell, white or colorless corpuscle of the blood or lymph," 1860, via French leucocyte, from leuco-, a Latinized combining form of Greek leukos "white, clear," from PIE root *leuk- "light, brightness" + -cyte "cell."

updated on October 09, 2017

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Definitions of leukocyte from WordNet

leukocyte (n.)
blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system;
Synonyms: leucocyte / white blood cell / white cell / white blood corpuscle / white corpuscle / wbc
From wordnet.princeton.edu, not affiliated with etymonline.