The Collaborative International Dictionary
Declinator
Declinator \Dec"li*na`tor\, n. [Cf. F. d['e]clinateur. See Decline.]
An instrument for taking the declination or angle which a plane makes with the horizontal plane.
A dissentient. [R.]
--Bp. Hacket.
Wiktionary
declinator
n. 1 An instrument for taking the declination or angle which a plane makes with the horizontal plane. 2 (context obsolete English) A dissenter.