brainbrain1 /breɪn/ ●●● noun 
1
[countable, uncountable] science, biology the organ inside your head that controls how you think, feel, and move: 
brain damage Different parts of the brain have different functions.2[countable usually plural, uncountable] the ability to think clearly and learn quickly: The kid’s definitely got brains.3[countable] informal someone who is very intelligent: Some of the best brains in the country are here tonight.4be the brains behind something to be the person who thought of and developed a particular plan, system, organization, etc. → no-brainer, pick somebody’s brain(s) at pick1, rack your brain(s) at rack2
1 [countable, uncountable] science, biology the organ inside your head that controls how you think, feel, and move: brain damage Different parts of the brain have different functions.2[countable usually plural, uncountable] the ability to think clearly and learn quickly: The kid’s definitely got brains.3[countable] informal someone who is very intelligent: Some of the best brains in the country are here tonight.4be the brains behind something to be the person who thought of and developed a particular plan, system, organization, etc. → no-brainer, pick somebody’s brain(s) at pick1, rack your brain(s) at rack2
