reservatory1
/rɪˈzəːvət(ə)ri/Now rare
noun
A place in which water is collected; a reservoir; a cistern, a tank. Also (occasionally): a receptacle for any liquid.
Origin
Mid 17th century (in an earlier sense). From post-classical Latin reservatorium storehouse from classical Latin reservāt-, past participial stem of reservāre + -ōrium.
reservatory2
/rɪˈzəːvət(ə)ri/adjective
Chiefly Law. Having the effect of reserving something.
Origin
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.