brain
1. brain \'bra-n\ n [ME, fr. OE brgen; akin to MLG bregen brain, Gk
brechmo]s front part of the head 1a: the portion of the vertebrate central
nervous system that constitutes t he organ of thought and neural
coordination, includes all the higher nervous centers receiving stimuli
from the sense organs and interpreting and correlating them to formulate
the motor impulses, is made up of neurons and supporting and nutritive
structures, is enclosed within the skull, and is continuous with the spinal
cord through the foramen magnum 1b: a nervous center in invertebrates
comparable in position and function t o the vertebrate brain 2a: INTELLECT,
INTELLIGENCE - often used in pl. 2b1: a very intelligent or intellectual
person 2b2: the chief planner of an organization or enterprise - usu. used
in pl .
2. brain vt 1: to kill by smashing the skull 2: to hit on the head