Source : Webster's Revised Unabridged Dictionary (1913)

Ew \Ew\, n. [See {Yew}.]
   A yew. [Obs.] --Chaucer.

Source : WordNet®

EW
     n : military action involving the use of electromagnetic energy
         to determine or exploit or reduce or prevent hostile use
         of the electromagnetic spectrum [syn: {electronic warfare}]