The combining form of the Greek word 'a`stron, meaning star.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). astro-. Retrieved September 20, 2026, from http://smartdefine.org/astro-/definitions/1976664 |
| Chicago | Webster's. 2011. "astro-" http://smartdefine.org/astro-/definitions/1976664 (accessed September 20, 2026). |
| Harvard | Webster's 2011, astro-, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/astro-/definitions/1976664>. |
| MLA | Webster's. "astro-" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/astro-/definitions/1976664> |