There are 2 main definitions of tester in English:

tester1

Syllabification: test·er
Pronunciation: /ˈtestər
 
/

noun

1A person who tests something, especially a new product.
More example sentences
  • All products are tested blindly, so testers are not influenced by designer names and fancy packaging.
  • It is only on the basis of the tester's appraisal that we carry out any remedial work and then only if it is strictly necessary.
  • The testers used each product and timed the process of creating a Web site, including the addition of text, graphics, links and publishing to a Web server.
1.1A person who tests another’s proficiency.
More example sentences
  • The selected testers, in addition to conducting the tests, asked the learner drivers a series of questions relating to basic maintenance of vehicles.
  • With the PADI ‘resort course’ that is available in most islands, it is quite possible to get underwater within a day; it consists of safety instruction and a tester in a pool, followed by a guided open-water dive on the reef.
  • The company has 22 tutors and 16 testers and does not use an automatic testing system, as is common practice in other workplaces.
1.2A device that tests the functioning of something: a cake tester
More example sentences
  • Heart valve testers are used by surgeons to check the function of mechanical heart valves after they have been sewn into the heart.
  • The tester offers a set-up function to allow operators to set various parameters used in testing configuration and memory storage.
  • Check each cell with a battery tester such as the Radio Shack 22-093.
1.3A sample of a product provided so that customers can try it before buying it.
More example sentences
  • Additionally, create inviting retail displays that are visual, entertaining and that offer samples and testers.
  • To find your shade, squirt a little of the tester onto the back of your hand.

Definition of tester in:

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There are 2 main definitions of tester in English:

tester2

Syllabification: test·er
Pronunciation: /ˈtestər
 
/

noun

A canopy over a four-poster bed.
More example sentences
  • She tossed her bag onto a lovely old four-poster bed complete with tester.
  • For the panel hanging behind the headboard, cut fabric long enough to hang from the tester, or framework, to just below the mattress.

Origin

late Middle English: from medieval Latin testerium, testrum, from a Romance word meaning 'head', based on Latin testa 'tile'.

Definition of tester in: