leukemia (any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen)
leukocyte or leucocyte (any of the colorless or white cells in the blood that have a nucleus and cytoplasm and help protect the body from infection and disease through specialized neutrophils, lymphocytes, and monocytes)
leukocytosis or leucocytosis (an abnormally large increase in the number of white blood cells in the blood, often occurring during an acute infection or inflammation)
leukoderma or leucoderma (partial or total loss of skin pigmentation, often occurring in patches)
leukopenia or leucopenia (an abnormally low number of leukocytes in the circulating blood)
leukoplakia or leukoplasia (an abnormal condition characterized by white spots or patches on mucous membranes, especially of the mouth and vulva)
leukotomy or leucotomy (a prefrontal lobotomy)
leukotriene (any of several lipid compounds that contain 20 carbon atoms, are related to prostaglandins, and mediate the inflammatory response)
Definitions are taken from:
The American Heritage® Dictionary of the English Language, Third Edition copyright © 1992 by Houghton Mifflin Company.
Electronic version licensed from InfoSoft International, Inc. All rights reserved.
Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002.
http://unabridged.merriam-webster.com (30 Sep. 2006).
English-Word Information: Word Info about English Vocabulary (wordinfo.info).