| Definition | a branch of biology concerned with the discovery or study of life on the celestial bodies |
| OED requirements | antedating 1941 |
| Earliest cite | Astronomical Society of the Pacific leaflet #143 |
| Comment | Bill Mullins submitted a January 1941 cite from the Astronomical Society of the Pacific. Leaflet #143.
Earliest cite in the OED was from 1955 |
| Last modified | 6 July, 2008 |