Definition of astro- in English:

astro-

Pronunciation: /ˈastrəʊ/

combining form

  • 1Relating to the stars or celestial objects: astrodome astrophotography
  • 1.1Relating to outer space: astrochemistry

Origin

from Greek astron 'star'.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space