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equivoluminal

equivoˈluminal, a. Physics.
  [See equi-.]
  Having an equal unchanging volume (see quot.).

1899 Kelvin in Phil. Mag. XLVII. 480 On the Application of Force within a Limited Space, required to produce Spherical Solitary Waves, or Trains of Periodic Waves, of both Species, Equivoluminal and Irrotational, in an Elastic Solid. Note, By ‘equivoluminal’ I mean every part of the solid keeping its volume unchanged during the motion.

Oxford English Dictionary

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