n. In botany, a spur; a hollow projection from the base of a petal or sepal; the nectary (nectarium) of Linnæus.n. In anatomy, a projection into the posterior horn of the lateral ventricle of the brain of man and some other mammals; the calcar avis or hippocampus minor.n. In ornithology, a spur.n. In Rotifera, a spur-like setigerous process more or less closely attached to the single ganglion of these animals, near the trochal disk.n. In Chiroptera, a slender elongated bone or cartilage upon the inner side of the ankle-joint, assisting in the support of the patagium.n. [capitalized] [NL.] In entomology, a genus of atracheliate beetles, of the family Tenebrionidæ.n. [capitalized] [NL.] In conchology, a genus of mollusks.n. The spur forming part of any ceremonial costume.n. In glass-works, an oven or furnace for calcining the materials of frit, prior to melting. Also called fritting-furnace.n. In metallurgy, an annealing-arch or -oven.n. In entomology, one of the spines at the tips of the tibiæ of certain insects, especially the Hymenoptera. Also called spur.