Air that is heated and directed through ducts, plenums, etc. to the rooms in a building, as a form of central heating.

simple past tense and past participle of air brush

present participle of air brush

plural of night air

(obsolete) A miasma, or noxious atmosphere. / Used other than figuratively or idiomatically: see night, air.

present participle of air one's dirty linen in public

present participle of air one's dirty laundry in public

A system designed to give assistance to aircraft, to prevent collisions and to manage aircraft flow.

(idiomatic) Talking a lot, especially without saying anything of value or meaning.

Alternative spelling of hot-air balloon