noun

tester

Translation

tester, examiner, sample

She works as a software tester.

Use this tester to check the battery.

I got a free perfume tester.

((a/the)) tester ((of sth.)) a person who tests sth. She is a tester of new video games.

((a/the)) tester ((for sth.)) a device for testing sth. This is a tester for water quality.

Synonyms: examiner, inspector, sample, probe

From the word 'test' plus the agent suffix '-er', indicating a person or thing that performs the action.

Think of a person who 'tests' things, a device that 'tests' things, or a small sample to 'test' something.