- exhaust (v.)
- 1530s, "to draw off or out, to use up completely," from Latin exhaustus, past participle of exhaurire "draw off, take away, use up," from ex- "off" (see ex-) + haurire "to draw up" (as water), from PIE *aus- "to draw water." Of resources, etc., from 1630s. Related: Exhausted; exhausting.
- exhaust (n.)
- "waste gas," 1848, originally from steam engines, from exhaust (v.). In reference to internal combustion engines by 1896.