Thăl'a-mŭs, n.

n.; pl. THĂL'I-A-MĪ.

1. (Anat.) One of two rounded and irregular surfaces in the two lateral ventricles of the brain, and in the third ventricle, from which the optic nerves were formerly thought to proceed. Dunglison.
2. (Bot.) (a.) The same as THALLUS, q. v. (b.) The receptacle of a flower; torus.