The Collaborative International Dictionary of English v.0.48:

Cavernous \Cav"ern*ous\, a. [L. cavernosus: cf. F. caverneux.]
   1. Full of caverns; resembling a cavern or large cavity;
      hollow.
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   2. Filled with small cavities or cells.
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   3. Having a sound caused by a cavity.
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   Cavernous body, a body of erectile tissue with large
      interspaces which may be distended with blood, as in the
      penis or clitoris.

   Cavernous respiration, a peculiar respiratory sound andible
      on auscultation, when the bronchial tubes communicate with
      morbid cavities in the lungs.
      [1913 Webster]