/ ˈteɪstə(r); NAmE / noun
1.
a person whose job is to judge the quality of wine, tea, etc. by tasting it
2.
( informal , especially BrE ) a small example of sth for you to try in order to see if you would like more of it
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WORD ORIGIN
late Middle English : in early use from Anglo-Norman French tastour , from Old French taster to taste; later from taste + -er .