n. 1. Physical or mental weariness resulting from effort or activity. 2. Something, such as tiring effort or activity, that causes tiredness or weariness: the fatigue of a long hike. 3. Physiology The decreased capacity or complete inability of an organism, organ, or part to function normally because of excessive stimulation or prolonged exertion. 4.
blood - the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets; blood carries oxygen and nutrients to the tissues and carries away waste products; the ancients believed that blood was the seat of the emotions
hemo-. blood: hemocyte. Classical Greek haimo- ; from haima, flowing blood (replacing earlier ear, blood, probably for reasons of taboo); probably akin to Old High German seim, thick-flowing honey; from Indo-European base an unverified form sei- , an unverified form soi- , to drip. Origin of hemo-.