tester

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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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