An eccentric; weirdo.
Something that is different from others in the same category; odd one out.
Someone who lacks a partner or team.
A temporary crew member who joins a mission with an established crew.
Someone perceived as odd, eccentric, and/or extreme.
Someone with crazy or extreme political views (especially extreme conservative views).
A member of the air force (in a town that hosts a USAF installation).
A mentally ill homeless person.
A deciduous tree of the genus Pterocarya native to Asia.