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Noun, pl. veins (Anatomy) 1. Blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. (wikipedia.org) 2. A blood vessel that transports blood from the capillaries back to the heart. (wiktionary.org) 3. (used in plural veins) The entrails of a shrimp. (wiktionary.org) (Botany) 1. In leaves, a thickened portion of the leaf containing the vascular bundle (wiktionary.org). One of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other expanded plant organ. Also called nervure (thefreedictionary.com). 2. A slender rib running through a leaf or bract, typically dividing or branching, and containing a vascular bundle. (Google Dictionary) (Zoology) 1. The nervure of an insect’s wing (wiktionary.org); One of the horny ribs that stiffen and support the wing of an insect. Also called nervure (thefreedictionary.com). 2. A hardened branching rib that forms part of the supporting framework of a wing, consisting of an extension of the tracheal system; a nervure. (Google Dictionary) (Geology) 1. A regularly shaped and lengthy occurrence of an ore; a lode (thefreedictionary.com). Other definitions 1. A fissure, crack, or cleft (thefreedictionary.com). 2. A fracture in rock containing a deposit of minerals or ore and typically having an extensive course underground....