Pronunciation: (su-rē'brum, ser'u-), [key]
—pl. -brums, -braPronunciation: (-bru). [key] Anat., Zool.
1. the anterior and largest part of the brain, consisting of two halves or hemispheres and serving to control voluntary movements and coordinate mental actions.
2. the forebrain and the midbrain. See illus. under brain.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.