Someone who does brain surgery. / (idiomatic) Someone very intelligent.

Any of many rhythmic fluctuations of electric potential between parts of the brain, especially those seen on an electroencephalogram / A sudden idea, understanding, or inspiration; a brainstorm

(telecommunications) A telecommunications switching system, physically located at a customer's place of business, that provides internal communication between users and also access to outside (trunk) telephone lines.

present participle of brace

Invigorating or stimulating.

(uncountable) That which braces. / (countable) A brace. / (US) A form of the military attention stance.

impetuous and rash; hot-headed

(historical) A Mexican national working as an agricultural laborer in the United States from 1942-1964, or similarly a railroad worker from 1942-1945.

(computing) Either of the inequality signs < and >, when used as brackets in programming languages and markup languages.

The symbol ")". / The right square bracket, "]".