As′tro‐pho‐tom″e‐try (?), n.(Astron.) The determination of the brightness of stars, and also of the sun, moon, and planets. — As′tro‐pho′to‐met″ric‐al (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.