n. A prop or support.n. In mech., the point of rest about which a lever turns in lifting a body; also, a prop or support for a lever at this point. See lever.n. In botany, an accessory organ, such as a bract, stipule, spine, etc., or one of the aërial roots of climbing plants, as of ivy.n. In mycology, one of the radiating appendages of the perithecia of Erysipheæ.n. In entomology, the inferior horny surface of the ligula, found in many Hymenoptera, etc. Also called the os hyoideum.n. In ichthyology, a special scale or spine on the fore edge of the anterior fin-rays of the dorsal or caudal fins of certain ganoid fishes, as Lepidosteus, Acipenser, and many fossil genera.To furnish with a fulcrum; establish as a fulcrum.n. In rotifers, the short stem of the incus, one of the parts of the mastax or pharyngeal mill.n. In the trilobites, the bend or the point of abrupt curvature of the thoracic pleura, which divides them into proximal and distal portions.