brainteaser

noun — 2 senses

noun

US /ˈbɹeɪnˌtizɚ/

Etymology From brain + teaser.

Informal A problem or puzzle devised to exercise the brain and mind.

She bought me a book of brainteasers, which is both entertaining and also supposedly good for decreasing dementia risk.

Informal Any difficult problem or puzzle.

Trying to figure out how to square this circle is a brainteaser to say the least.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.