trip·per

[trip-er]
noun
1.
a person or thing that trips.
2.
Machinery.
a.
a tripping mechanism; a trip.
b.
an apparatus causing a signal or other operating device to be tripped or actuated.
3.
British Informal. a person who goes on a pleasure trip or excursion; excursionist.
4.
Slang. a person who is under the influence of a hallucinogenic drug, especially LSD.

Origin:
1350–1400; Middle English; see trip1, -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To tripper
00:10
Tripper is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
tripper (ˈtrɪpə) [Click for IPA pronunciation guide]
 
n
1.  a person who goes on a trip
2.  chiefly (Brit) a tourist; excursionist
3.  another word for trip
4.  a.  any device that generates a signal causing a trip to operate
 b.  the signal so generated

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The top side, aft, should have a ring either side of center that should be
  seized together for the tripper to go into.
Prior to the tripper plate, the flame was laminar and steady.
Before the tripper plate, the flame is laminar and steady.
The tripper is a device that discharges material from a belt conveyor.
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