Vocabulary : Air to Air drill

Air : The fluid which we breathe, and which surrounds the earth; the atmosphere. It is invisible, inodorous, insipid, transparent, compressible, elastic, and ponderable. ;; Symbolically: Something unsubstantial, light, or volatile. ;; A particular state of the atmosphere, as respects heat, cold, moisture, etc., or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc. ;; Any aeriform body; a gas; as, oxygen was formerly called vital air. ;; Air in motion; a light breeze; a gentle wind. ;; Odoriferous or contaminated air. ;; That which surrounds and influences. ;; Utterance abroad; publicity; vent. ;; Intelligence; information. ;; A musical idea, or motive, rhythmically developed in consecutive single tones, so as to form a symmetrical and balanced whole, which may be sung by a single voice to the stanzas of a hymn or song, or even to plain prose, or played upon an instrument; a melody; a tune; an aria. ;; In harmonized chorals, psalmody, part songs, etc., the part which bears the tune or me
Air bed : A sack or matters inflated with air, and used as a bed.
Air bladder : An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus. ;; A sac or bladder full of air in an animal or plant; also an air hole in a casting.
Air brake : A railway brake operated by condensed air.
Air brush : A kind of atomizer for applying liquid coloring matter in a spray by compressed air.

Air cell : A cavity in the cellular tissue of plants, containing air only. ;; A receptacle of air in various parts of the system; as, a cell or minute cavity in the walls of the air tubes of the lungs; the air sac of birds; a dilatation of the air vessels in insects.
Air chamber : A chamber or cavity filled with air, in an animal or plant. ;; A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.
Air cock : A faucet to allow escape of air.
Air cooling : In gasoline-engine motor vehicles, the cooling of the cylinder by increasing its radiating surface by means of ribs or radiators, and placing it so that it is exposed to a current of air. Cf. Water cooling.
Air drill : A drill driven by the elastic pressure of condensed air; a pneumatic drill.