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'.

Definition of astro- in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly