Definition of astro- in English:

astro-

Pronunciation: /ˈastrəʊ/

combining form

1Relating to the stars or celestial objects: astrodome astrophotography

Origin

from Greek astron 'star'.

Definition of astro- in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily