ex·plor·er

[ik-splawr-er, -splohr-]
noun
1.
a person or thing that explores.
2.
a person who investigates unknown regions: the great explorers of the Renaissance.
3.
any instrument used in exploring or sounding a wound, a cavity in a tooth, or the like.
4.
( initial capital letter ) . Also called Explorer Scout. a person between the ages 14 and 20 who is an active participant in the exploring program sponsored by the Boy Scouts of America.
5.
( initial capital letter ) Aerospace. one of a long series of U.S. scientific satellites: Explorer 1 (1958) was the first U.S. artificial satellite.

Origin:
1675–85; explore + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To explorer
00:10
Explorer is always a great word to know.
So is doohickey. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
explore (ɪkˈsplɔː) [Click for IPA pronunciation guide]
 
vb
1.  (tr) to examine or investigate, esp systematically
2.  to travel to or into (unfamiliar or unknown regions), esp for organized scientific purposes
3.  (tr) med to examine (an organ or part) for diagnostic purposes
4.  obsolete (tr) to search for or out
 
[C16: from Latin explōrāre, from ex-1 + plōrāre to cry aloud; probably from the shouts of hunters sighting prey]
 
ex'plorer
 
n

Explorer1 (ɪkˈsplɔːrə) [Click for IPA pronunciation guide]
 
n
(US) Brit equivalent: Venture Scout a member of the senior branch of the Scouts

Explorer2 (ɪkˈsplɔːrə) [Click for IPA pronunciation guide]
 
n
any of the first series of US satellites. Explorer 1, launched in 1958, confirmed the existence of intense radiation belts around the earth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

explorer
1680s, agent noun from explore. Replaced earlier exploratour (mid-15c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

explorer ex·plor·er (ĭk-splôr'ər)
n.
A sharp, pointed probe used on tooth surfaces to detect caries or other defects.

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
His viewpoint was totally different from that of the trapper or pioneer,
  explorer or traveller.
Build these large explorer ships in space with landing and takeoff shuttles
  attached.
He's an architect by training but an explorer at heart.
He is an adventurous and indefatigable traveler as well as a brilliant explorer
  of arcane problems and archives.
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