The Collaborative International Dictionary
Incavation
Incavation \In`ca*va"tion\ ([i^]n`k[.a]*v[=a]"sh[u^]n), n. Act of making hollow; also, a hollow; an excavation; a depression.
Wiktionary
incavation
n. 1 The act of making hollow. 2 A hollow; a physical depression.