| Definition | the scientific study of extraterrestrial phenomena, esp. xenobiology |
| OED requirements | antedating 1954 |
| Earliest cite | 1954 R. Heinlein 'The Star Lummox' |
| Last modified | 6 July, 2008 |
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| 1998 D. Brin Heaven's Reach 160 | Lark abruptly recalled something he had read once, in a rare galacto-xenology text, about a type of hydro-life called Zang. |