/ Dictionary / Index L leukosis: Meaning and Definition of Find definitions for: leu•ko•sis Pronunciation: (l-kō'sis), [key] — n. Vet. Pathol. any of several diseases occurring chiefly in chickens, involving proliferation of the leukocytes and characterized by paralysis, blindness, formation of tumors in the internal organs, and bone calcification. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leukopoiesis Leukothea Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language