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
(hÄ'mÄ-tol'Å-jÄ, hem-Ä-), 1  The medical specialty that pertains to the anatomy, physiology, pathology, symptomatology, and therapeutics related to the blood and blood-forming tissues. 2  Synonym(s): hemology. [ 3 hemato- + G. logos, study] 4  The branch of medicine that deals with the diagnosis and treatment of diseases of the blood and bone marrow. heâ²maÂ·toÂ·logâ²ic (-tÉ-lÅjâ²Ä­k), heâ²maÂ·toÂ·logâ²iÂ·cal adj. heâ²maÂ·toÂ·logâ²iÂ·calÂ·ly adv. heâ²maÂ·tolâ²oÂ·gist n.