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.
astro- + -meter (Wiktionary)