/ Dictionary / Index T thalamus: Meaning and Definition of Find definitions for: thal•a•mus Pronunciation: (thal'u-mus), [key] — pl. -mi the middle part of the diencephalon through which sensory impulses pass to reach the cerebral cortex. a receptacle or torus. Also calledan apartment for women in an ancient Greek house. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thalamus (Thesaurus) thalamium Thalassa Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language