Main Entry:

res·er·voir

Pronunciation:

\ˈre-zə-ˌvwär, -zər-, -ˌvwȯr also -ˌvȯi\

Function:

noun

Etymology:

French réservoir, from Middle French, from reserver

Date:

1690

1: a place where something is kept in store: as a: an artificial lake where water is collected and kept in quantity for use b: a part of an apparatus in which a liquid is held c: supply, store <a large reservoir of educated people> 2: an extra supply : reserve3: an organism in which a parasite that is pathogenic for some other species lives and multiplies usually without damaging its host