Meaning of killer

kill•er

Pronunciation: (kil'ur), [key]
— n.
  1. a person or thing that kills.
  2. See
  3. a device used by a post office for printing cancellations on postage stamps.
  4. a mark of cancellation made on a postage stamp.
  5. something or someone having a formidable impact, devastating effect, etc.: The math test was a real killer.
—adj.
  1. severe; powerful: a killer cold.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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