a person or thing that excavates.
a power-driven machine for digging, moving, or transporting loose gravel, sand, or soil.
a sharp, spoonlike instrument used for scraping out diseased tissue, as in dentistry.

1805–15; excavate + -or2

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World English Dictionary
excavator (ˈɛkskəˌveɪtə)
1.  a powered machine for digging earth, gravel, sand, etc, esp a caterpillar tractor so equipped
2.  any person, animal, or thing that excavates

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

excavator ex·ca·va·tor (ěk'skə-vā'tər)
An instrument, such as a sharp spoon or curette, used in scraping out pathological tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
On a good day, an experienced fossil excavator might uncover only a few inches of skeleton.
When it comes to hauling up the bounty, sophisticated deepwater excavator bots are still expensive to purchase outright.
It turns out that there are only one or two types of key for many models of hydraulic excavator.
He felt that he had to go ahead, knowing that if he delayed he might not get the excavator for weeks.
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