<p><strong>Noun</strong></p><ul><li>any abnormal phenomenon or product or unusual object; anomaly; aberration.</li><li>a person or animal on exhibition as an example of a strange deviation from nature.</li><li>a sudden and apparently causeless change or turn of events, the mind, etc.; an apparently capricious notion, occurrence, etc.: That kind of sudden storm is a freak.</li><li>Synonyms: crotchet, quirk, vagary.</li><li>Numismatics: an imperfect coin, undetected at the mint and put into circulation.</li><li>Philately: a stamp differing from others of the same printing because of creases, dirty engraving plates, etc.</li><li>Slang: a person who has withdrawn from normal, rational behavior and activities to pursue one interest or obsession: a drug freak.</li><li>a devoted fan or follower; enthusiast: a baseball freak.</li><li>Archaic: capriciousness; whimsicality.</li></ul><p><strong>Adjective</strong></p><ul><li>unusual; odd; irregular: a freak epidemic.</li></ul><p><strong>Verb</strong></p><ul><li>(used with or without object) to become or to make (someone) insane or out of control, as a result of being frightened, wildly excited, or high on drugs: The loud noise freaked the horses just as they were being loaded into trailers.</li><li>verb phrase Slang: freakout.</li></ul>