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Think tank

//ˈθɪŋk ˌtæŋk// noun

Noun

1
A group of people who collectively perform research and develop reports and recommendations on topics relating to strategic planning or public policy, and which is usually funded by corporate, government, or special interests. idiomatic
"Why don't we take a leaf out of the government's book and have a think tank?"
2
a company that does research for hire and issues reports on the implications wordnet
3
The brain. obsolete
"Slade’s eyes, china blue and menacing, held hers for an instant, then he turned again to her father and completed his sentence, “or else I think I know a stunt that will speed up your work . . . something that will make your think-tank bubble a bit faster. And if it don’t, then you’ll learn something about Hoppy Slade that you didn’t know before. Go to bed and sleep on that!”"

From the use of think tank or think box in the 19th century to refer to the human brain.

Unscramble this word: thinktank