WordReference Random House Unabridged Dictionary of American English © 2017
as•trom•e•try  (ə stromi trē),USA pronunciation n. 
  1. Astronomythe branch of astronomy that deals with the measurement of the positions and motions of the celestial bodies. Also called  positional astronomy. 
as•tro•met•ric  (as′trō metrik),USA pronunciation  as′tro•metri•cal, adj. 
  • 1865–70; astro- + -metry

'astrometry' also found in these entries:
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