Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instrument designed to measure the brightness, relation, or apparent magnitude of stars.

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument for comparing the relative amount of the light of stars.

from The Century Dictionary and Cyclopedia

  • n. An instrument designed to measure the relation, brightness, or apparent magnitude of the stars.

Etymologies

astro- + -meter (Wiktionary)

Examples

  • "astrometer" in which an "artificial star," formed by the total reflection of moonlight from the base of a prism, served as a standard of comparison, he was able to estimate the lustre of the _natural_ stars examined by the distances at which the artificial object appeared equal respectively to each.

    A Popular History of Astronomy During the Nineteenth Century Fourth Edition

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