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/ˈôrəfis/ Noun, pl. orifices 1. A mouth or aperture, as of a tube, pipe, etc.; an opening. ( 2. An opening through which something may pass. ( 3. An opening or aperture; any external opening in the body of an animal. ( 4. An aperture or hole that opens into a bodily cavity. ( Word origin: From Middle French orifice “the opening of a wound” and directly from Latin orificium “an opening,” literally “mouth-making,” from os , “mouth” + facere...

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/or´ĭ-jin/ Noun, pl. origins 1. The source or beginning of anything, especially the more fixed end or attachment of a muscle (as distinguished from its insertion), or the site of emergence of a peripheral nerve from the central nervous system. (Dorland’s Medical Dictionary for Health Consumers. © 2007 by Saunders) 2. The starting point of a cranial or spinal nerve. (The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company) 3. The tendinous attachment of a muscle to the bone that remains fixed when the muscle contracts. In most cases, the origin is medial to the insertion. (Jonas: Mosby’s Dictionary of Complementary and Alternative Medicine. (c) 2005, Elsevier) 4. The birth, existence, or beginning; starting point. ( 5. The cause; that which causes something to arise. (   Word origin:From Latin origo,...

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Struggling in Biology?

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Confused about the MCAT? Not sure how to prepare? This guide will show you how