Dictionary.com
Thesaurus.com
Synonyms

tester

1 American  
[tes-ter] / ˈtɛs tər /

noun

  1. a person or thing that tests.

tester 2 American  
[tes-ter, tees-] / ˈtɛs tər, ˈtis- /

noun

  1. a canopy, as over a bed or altar.

tester 3 American  
[tes-ter] / ˈtɛs tər /

noun

  1. the teston of Henry VIII.

tester 1 British  
/ ˈtɛstə /

noun

  1. a person or thing that tests or is used for testing

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
tester 2 British  
/ ˈtɛstə /

noun

  1. (in furniture) a canopy, esp the canopy over a four-poster bed

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
tester 3 British  
/ ˈtɛstə /

noun

  1. another name for teston

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of tester1

First recorded in 1655–65; test 1 + -er 1

Origin of tester2

First recorded in 1350–1400; Middle English tester, testo(u)r, testir, teester “headpiece,” from Old French testiere “headpiece, head covering,” from Medieval Latin testerium, testrum, testura “canopy of a bed”; derivative of Vulgar Latin testa “head,” from Latin testa “earthenware jar; brick; tile”; test 2

Origin of tester3

First recorded in 1560–70; earlier testorn, variant of teston, with -r- from Middle French testart “teston”

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.