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  1. Noun.  A person who works in space.
  2. Noun.  An object inserted to hold a space open in a row of items eg. beads.
  3. Noun.  A bushing.
  4. Noun.  (slang) A forgetful person.
  5. Noun.  (medicine) A type of add-on device used by an asthmatic person to increase the effectiveness of a metered-dose inhaler.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.