tester
noun
[ ˈtɛstə ]
• a person who tests something, especially a new product.
• a sample of a product provided so that customers can try it before buying it.
tester
noun
• a canopy over a four-poster bed.
Origin:
late Middle English: from medieval Latin testerium, testrum, from a Romance word meaning ‘head’, based on Latin testa ‘tile’.