lo·ca·tor

[loh-key-ter, loh-key-ter]
noun
1.
a person who locates something.
2.
a person who determines or establishes the boundaries of land or a mining claim.
Sometimes, lo·cat·er.


Origin:
1600–10; < Latin locātor a contractor, lessor, equivalent to locā(re) (see locate) + -tor -tor

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Etymonline
Word Origin & History

locator
c.1600, of persons, from L. locator, agent noun from locare (see locate). Of things which locate, from 1902.
Online Etymology Dictionary, © 2010 Douglas Harper
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00:10
Locator is always a great word to know.
So is doohickey. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
American Heritage
Medical Dictionary

locator lo·ca·tor (lō'kā'tər)
n.
An instrument or apparatus for finding the position of a foreign object in 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
The app also features a look at the special edition car and a dealer locator.
Use the store locator below to find other retailers in your area.
The department's interactive park locator allows county residents and visitors
  to search parks by location and amenity.
Deck cranes then picked up truncated cones that had contained the chutes,
  locator beacons and other equipment.
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