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  1. Having to do with elastic waves. Energy may be transmitted through the body of an elastic solid by body waves of two kinds: P-waves (compressional waves) or S-waves (shear waves) (see P-waves, S-waves), or along boundaries between media of different elastic properties by head waves and surface waves (q.v.). Equated with "elastic," often with "acoustic" and "sonic."
  2. Having to do with natural earthquakes. Derived from the Greek "seismos" meaning "shock." While seismic is an adjective, it is frequently used as a noun.