Lewis & Short

spĕcŭlātrīx, īcis, f. [speculor], she that spies or watches, a (female) spy, watcher.

  1. I. Lit.: furiae deae sunt speculatrices, credo, et vindices facinorum et scelerum, * Cic. N. D. 3, 18, 46; Sen. Contr. 1, 6 med.: mens boni speculatrix consiliorum suorum est, Ambros. Ep. 67, 5; App. Doctr. Plat. 2, p. 16, 1: Caucasiis speculatrix Juno resedit rupibus, Val. Fl. 7, 190: SPECVLATRIX ET PROPVGNATRIX MEORVM PERICVLORVM, Inscr. Orell. 4859.
  2. II. Transf.: speculatrix villa profundi, i. e. that looks towards the sea, Stat. S. 2, 2, 3: aestuosi maris alto e tumulo speculatrix statua, Val. Max. 9, 8, ext. 1.