Meaning of RESERVOIR in English

RESERVOIR

■ noun

1》 a large natural or artificial lake used as a source of water supply.

↘a supply or source of something.

2》 a place where fluid collects, especially in rock strata or in the body.

3》 a receptacle or part of a machine designed to hold fluid.

Origin

C17: from Fr. réservoir , from réserver 'to reserve, keep'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.