explorer

[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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
explore (ɪkˈsplɔː)
 
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)
 
n
(US) Brit equivalent: Venture Scout a member of the senior branch of the Scouts

Explorer2 (ɪkˈsplɔːrə)
 
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
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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
Unfortunately with scientific expeditions, the mindset of the actual explorer is hardly relevant.
His viewpoint was totally different from that of the trapper or pioneer,
  explorer or traveller.
But the work of the genuine explorer and wilderness wanderer is fraught with
  fatigue, hardship, and danger.
He's an architect by training but an explorer at heart.
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