n. In Gr. archæol., an inner or private room; a chamber; especially, the women's apartment (Homeric); a sekos.n. In anatomy: The apparent origin of a cranial nerve; the place where a nerve emerges from or leaves the brain.n. Specifically, the optic thalamus; the thalamus of the optic nerve; the great posterior ganglion of the cerebrum, forming the lateral wall of the cerebral ventricle, and connected with its fellow by the middle commissure of the brain. See cut under cerebral.n. In botany: The receptacle or torus.n. Same as thallus.