brains

1. (plural, plural only)The substance of a brain, as a material or foodstuff.

2. (informal, plural, plural only)The figurative substance of a brain: mental ability, intelligence.

   Sadly, I got my brains from my mom and my looks from the mailman.

3. (informal, plural, plural only, with definite article)The intelligent person or people in a group: the director, planner, administrator, etc.

   Who's the brains behind this operation?

regular