from The Century Dictionary.

  • Sleep-preventing; causing wakefulness.
  • noun In medicine, something which tends to drive away sleep; an antihypnotic.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Anything which prevents sleep, or produces wakefulness, as strong tea or coffee.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective medicine Preventing sleep; causing wakefulness; insomniac.
  • noun medicine A medication that prevents sleep.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective of or pertaining to agrypnia


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  • Something administered to produce wakefulness.

    November 18, 2008

  • Keep it away from Prolagus.

    November 18, 2008

  • Tòó late.

    November 18, 2008