ASTR-

combining form

or astro-

Etymology: Middle English astro-, from Old French, from Latin astr-, astro-, from Greek, from astron star — more at star

1. : star

astr oid

astro meter

: the heavens

astro graphy

astro nautics

: astronomical

astro physics

2. : astrological

astro diagnosis

: astrological and

astro medical

3. : aster in cells

astro sphere