tester

tester1
noun
  1. a person who tests something, especially a new product
    （尤指新产品的）试验者；测试者
    ■a person who tests another's proficiency
    考官
    ■a device that tests the functioning of something
    测试器，测试仪
    a mains tester.
    电源测试器。
    ■a sample of a product provided so that customers can try it before buying it
    试用（产）品
tester2
noun
  1. a canopy over a four-poster bed
    （床的）天盖，华盖
语源
  1. late Middle English: from medieval Latin testerium, testrum, from a Romance word meaning 'head', based on Latin testa 'tile'
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