tester

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

Origin:
1655–65; test1 + -er1

Dictionary.com Unabridged

tester

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

tester

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. 2014.
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Collins
World English Dictionary
tester1 (ˈtɛstə)
 
n
a person or thing that tests or is used for testing

tester2 (ˈtɛstə)
 
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)
 
n
another name for teston

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
We approached the bed and examined it-a half-tester, such as is commonly found in attics devoted to servants.
As the recipe cross-tester, he spent four years troubleshooting recipes prior to their publication.
One tester keeps phoning these sentences to a tester in another room.
Today, after having two daughters, she works for her husband as a software
  tester.
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