Definition of astro- in English:

astro-

Syllabification: astro-

combining form

Relating to the stars, celestial objects, or outer space: astrocompass astrophysics astrochemistry astrophotography

Origin

from Greek astron 'star'.

Definition of astro- in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal