tester
test·er1 / ˈtestər/ • n. a person who tests something, esp. a new product. ∎ a person who tests another's proficiency. ∎ a device that tests the functioning of something: a cake tester. ∎ a sample of a product provided so that customers can try it before buying it.test·er2 • n. a canopy over a four-poster bed.
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tester