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
blood noun [U] (LIQUID). A2 the âred âliquid that is âsent around the âbody by the âheart, and âcarries âoxygen and âimportant âsubstances to âorgans and âtissue, and âremoves âwaste âproducts: He âlost a lot of blood in the âaccident.ive/donate blood âº to âallow a âtrained âperson to take some blood from âyour âbody so that it can be âstored and is âready to be given to âpeople who have âlost a lot of blood in an âaccident or âoperation. More examples. 1  The â teacher â drew a â diagram â showing how the blood â flows through the â heart.