n. [ Gr. &unr_;, fr. &unr_; observing the heavenly bodies; &unr_; + &unr_; to view: cf. F. météoroscope. See Meteor. ] (Astron.) (a) An astrolabe; a planisphere. [ Obs. ] (b) An instrument for measuring the position, length, and direction, of the apparent path of a shooting star. [ 1913 Webster ]