astro-

a combining form with the meaning “pertaining to stars or celestial bodies, or to activities, as spaceflight, taking place outside the earth's atmosphere,” used in the formation of compound words: astronautics; astrophotography.
Compare cosmo-.

Origin of astro-

< Greek, combining form of ástron a star, constellation, akin to astḗr star; cf. aster, -aster2

Words nearby astro-

astride, astringe, astringent, astringer, astrionics, astro-, astro-inertial guidance, astroarchaeology, astrobiology, astroblast, astroblastoma

British Dictionary definitions for astro-

astro-

combining form

indicating a heavenly body, star, or star-shaped structure astrology; astrocyte
indicating outer space astronautics

Word Origin for astro-

from Greek, from astron star

Scientific definitions for astro-

astro-

A prefix that means “star” (as in astrophysics), “celestial body” (as in astronomy), or “outer space” (as in astronaut).