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The Collaborative International Dictionary
Declinator

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.

  2. 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.