U

non-exhaustible

verb (used with object)

to drain of strength or energy, wear out, or fatigue greatly, as a person: I have exhausted myself working.
to use up or consume completely; expend the whole of: He exhausted a fortune in stock-market speculation.
to draw out all that is essential in (a subject, topic, etc.); treat or study thoroughly.
to empty by drawing out the contents: to exhaust a tank of fuel oil.
to create a vacuum in.
to draw out or drain off completely.
to deprive wholly of useful or essential properties, possessions, resources, etc.
Chemistry, Pharmacology. to deprive of ingredients by the use of solvents, as a drug.
to destroy the fertility of (soil), as by intensive cultivation.

verb (used without object)

to pass out or escape, as spent steam from the cylinder of an engine.

noun Machinery.

the escape of steam or gases from the cylinder of an engine.
the steam or gases ejected.
Also called exhaust system. the parts of an engine through which the exhaust is ejected.

verb (mainly tr)

to drain the energy of; tire outto exhaust someone by constant questioning
to deprive of resources, etca nation exhausted by war
to deplete totally; expend; consumeto exhaust food supplies
to empty (a container) by drawing off or pumping out (the contents)
to develop or discuss thoroughly so that no further interest remainsto exhaust a topic of conversation
to remove gas from (a vessel, etc) in order to reduce the pressure or create a vacuum; evacuate
to remove or use up the active ingredients from (a drug, solution, etc)
to destroy the fertility of (soil) by excessive cultivation
(intr) (of steam or other gases) to be emitted or to escape from an engine after being expanded

noun

gases ejected from an engine as waste products
1. the expulsion of expanded gas or steam from an engine
2. (as modifier)exhaust stroke
1. the parts of an engine through which the exhausted gases or steam pass
2. (as modifier)exhaust valve; exhaust pipe

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. n.“waste gas,” 1848, originally from steam engines, from exhaust (v.). In reference to internal combustion engines by 1896.