Dictionary.net

• also leuko-.

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth

• comb, form of Greek leukos white, as -cyte colourless corpuscle of blood or found in lymph &c., -pathy albinism, -rrhoea mucous discharge from female genitals, the whites.

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry