The remains of a ringfort or other circular dwelling, superstitiously said to be associated with fairies or leprechauns.

plural of fairy ring

plural of fairy fort

plural of fairy tale

plural of fairy penguin

plural of fairy godmother

(originally Cockney rhyming slang) fair enough

A chess variant: chess with unusual rules or pieces. / Synonym of fairy problem: an unusual chess problem.

(UK) Small electric lights on a strand which are used decoratively, especially on Christmas trees.

(humorous, chiefly Internet slang) fair enough