n. In anatomy and zoology, a hole or an opening; an orifice; a fissure; a short passage.n. In botany, an opening of any kind; specifically, the orifice of the coats of the ovule.n. See the adjectives.n. The carotid canal itself.n. Posterior, for the passage of a vein.n. Of the medulla oblongata, a cul-de-sac forming the termination of the anterior median fissure behind the pons. Also called foramen cæcum of Vicq d'Azyr.n. Of the tongue, a depression about the large middle circumvallate papilla.n. Of the sphenoid bone, a hole in the greater wing of the sphenoid, or between this and the temporal bone, for the passage of the third division of the fifth cranial nerve. See cut under sphenoid.