To hollow out, or make a hollow or cavity in, by digging or scooping out the inner part, or by removing extraneous matter: as, to excavate a tumulus or a buried city for the purpose of exploring it; to excavate a cocoanut.To form by scooping or hollowing out; make by digging out material, as from the earth: as, to excavate a tunnel or a cellar.In zoology: Formed as if by excavation; hollowed, but having the inner surface irregularly rounded.Widely and irregularly notched: said of a margin or mark.