The Collaborative International Dictionary
Dispositor
Dispositor \Dis*pos"it*or\, n. [L. See Disposition.]
A disposer.
(Astrol.) The planet which is lord of the sign where another planet is. [Obs.]
--Crabb.
Wiktionary
dispositor
n. 1 (context obsolete English) A disposer. 2 (context obsolete astrology English) The planet that is lord of the sign where another planet is.