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
1 : one of the blood vessels that carry the blood back to the heart. 2 : a long narrow opening in rock filled with a specific mineral a vein of gold. 3 : a streak of different color or texture (as in marble) 4 : a style of expression I continued in a more serious vein.