test·er

1 [tes-ter]
noun
a person or thing that tests.

Origin:
1655–65; test1 + -er1

Dictionary.com Unabridged

tes·ter

2 [tes-ter, tees-]
noun
a canopy, as over a bed or altar.

Origin:
1350–1400; Middle English < Medieval Latin testrum canopy of a bed; akin to Latin testa covering. See test2

00:10
Tester is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

tes·ter

3 [tes-ter]
noun
the teston of Henry VIII.

Origin:
1540–50; earlier testorn, variant of teston, with -r- from Middle French testart teston

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
tester1 (ˈtɛstə) [Click for IPA pronunciation guide]
 
n
a person or thing that tests or is used for testing

tester2 (ˈtɛstə) [Click for IPA pronunciation guide]
 
n
(in furniture) a canopy, esp the canopy over a four-poster bed
 
[C14: from Medieval Latin testerium, from Late Latin testa a skull, from Latin: shell]

tester3 (ˈtɛstə) [Click for IPA pronunciation guide]
 
n
another name for teston

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

tester
"one who tests," 1661, from test.

tester
"canopy over a bed," late 14c., from M.L. testerium, from testera "head stall," from L.L. testa (capitis) "skull," from L., lit. "earthenware, pot." The "head" sense (originally merely humorous) is the source of tester in obs. senses of "piece of armor for the head" (late 14c.) and "coin of Henry VIII"
(1546), the first Eng. coin to bear a true portrait. For sense development, cf. O.E. cuppe "cup" from source of Ger. kopf "head."
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

tester

canopy, usually of carved or cloth-draped wood, over a bed, tomb, pulpit, or throne. It dates from the 14th century and is usually made of the same material as the object it covers. It can be supported either by four posts, by two posts at the foot and a headpiece at the back, or by suspension from the ceiling. The edges may overhang and in some cases are decorated with incised work or a fabric valance. The word, derived from the late Latin testa ("head"), came into use in the Middle Ages, originally referring only to the vertical headpiece.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Tester moves to protect combat veterans' trophy firearms.
Tester introduces legislation to strengthen transparency, accountability in
  government.
It also makes sure patients aren't abusing the privilege of being a drug tester.
Today, after having two daughters, she works for her husband as a software
  tester.
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