Real Dictionary

brain
a substance produced by homogenizing [...]
an interconnected group or system [...]
anything serving to obstruct passage or to maintain separation, such as a fence or gate [...]
the act of responding; reply or reaction [...]
the soft convoluted mass of nervous tissue within the skull of vertebrates that is the controlling and coordinating centre of the nervous system and the seat of thought, memory, and emotion. It includes the cerebrum, brainstem, and cerebellum [...]
to make active or capable of action [...]
unspecialized plant tissue consisting of simple thin-walled cells with intervening air spaces: constitutes the greater part of fruits, stems, roots, etc [...]
countable noun: Your brain is the organ inside your head that controls your body's activities and enables you to think and to feel things such as heat and pain.