Definition of reservatory in US English:

reservatory

noun

rare
  • A place in which water is collected; a reservoir; a cistern, a tank. Also (occasionally): a receptacle for any liquid.

adjective

  • Chiefly Law. Having the effect of reserving something.

Origin

Mid 17th century (in an earlier sense). From post-classical Latin reservatorium storehouse from classical Latin reservāt-, past participial stem of reservāre + -ōrium<br>mid 17th century (in an earlier sense). From post-classical Latin reservatorius that may be used for keeping back or storage, reserved, set apart, of or belonging to reservation from classical Latin reservāt-, past participial stem of reservāre + -ōrius. Compare Middle French reservatoire.

Pronunciation

reservatory

/rɪˈzəːvət(ə)ri/