Longman Dictionary of Contemporary English homepage

Language: Old French
Origin: Latin, from Greek, from astron 'star'

astro-

 prefix
     
Related topics: Astronomy
astro-
XX relating to the stars, the planets, or space:
an astronaut (=someone who travels in space)
astronomy (=scientific study of the stars)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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