declinator

from The Collaborative International Dictionary of English v.0.48

Declinator \Dec"li*na`tor\, n. [Cf. F. d['e]clinateur. See
   {Decline}.]
   1. An instrument for taking the declination or angle which a
      plane makes with the horizontal plane.
      [1913 Webster]

   2. A dissentient. [R.] --Bp. Hacket.
      [1913 Webster]