The Collaborative International Dictionary of English v.0.48:

Incavated \In"ca*va`ted\ ([i^]n"k[.a]*v[=a]`t[e^]d), a. [L.
   incavatus, p. p. of incavare to make hollow: pref in- in +
   cavare to hollow out, fr. cavus hollow.]
   Made hollow; bent round or in.
   [1913 Webster]