air drill

== English == === Noun === air drill (plural air drills) A drill driven by the elastic pressure of condensed air; a pneumatic drill. === References === Edward H[enry] Knight (1877), “Air drill”, in Knight’s American Mechanical Dictionary. […], volumes I (A–GAS), New York, N.Y.: Hurd and Houghton […], →OCLC. “air drill”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.