exhaustible

Concise Oxford English Dictionary © 2008 Oxford University Press:
exhaust /ɪgˈzɔːst, ɛg-/

▶verb

• 1 (often as adj. exhausted or exhausting) tire out completely.

• 2 use up (resources or reserves) completely.

  ■ explore (a subject) thoroughly.

• 3 expel (gas or steam) from an engine or other machine.

▶noun waste gases or air expelled from an engine or other machine.

■ the system through which waste gases are expelled.

– derivatives
exhaustedly adverb,
exhauster noun,
exhaustibility /-ˈbɪlɪti/ noun,
exhaustible adjective,
exhaustingly adverb.

– origin C16: from L. exhaust-, exhaurire ‘drain out’.