'Excavator' definitions:

Definition of 'excavator'

From: WordNet
noun
A workman who excavates for foundations of buildings or for quarrying
noun
A machine for excavating [syn: power shovel, excavator, digger, shovel]

Definition of 'Excavator'

From: GCIDE
  • Excavator \Ex"ca*va`tor\, n. One who, or that which, excavates or hollows out; a machine, as a dredging machine, or a tool, for excavating. [1913 Webster]