1) Pneumatic tool 
• A drill driven by the elastic pressure of condensed air; a pneumatic drill.
(from the article `mining`) The invention of mechanical drills powered by compressed air (pneumatic hammers) increased markedly the capability to mine hard rock, decreasing the ... ...hydraulic ram air compressors, and construction camps for workers complete with dormitories, family housing, schools, hospitals, a recreation ... [2 re...
<equipment> A drill driven by the elastic pressure of condensed air; a pneumatic drill. ... (06 Aug 1998) ... 
Air' drill` A drill driven by the elastic pressure of condensed air; a pneumatic drill. Knight. 
a drill powered by compressed air.