brain

From Wiktionary
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The Simple English Wikipedia has an article on:

Pronunciation[change]

Noun[change]

Singular
brain

Plural
brains

Top view of a brain
Side view of a brain
  1. (countable) Your brain is the part of your body that is inside your head.
    The brain is the part of the body that thinks and controls the rest of the body through the nervous system.
    He has serious brain damage from falling off of his bicycle and hitting his head.