IPA: /ˈlɪkər/
KK: /ˈlɪkər/
A person or animal that uses their tongue to touch or taste something.
The dog is a licker, always licking my hand when I pet him.
Licker → The word is formed from 'lick' (from Old English 'liccian', meaning to touch with the tongue) and '-er' (meaning a person who). A 'licker' is a person or thing that licks.
Think of someone who 'touches with the tongue' ('lick') — the '-er' just means a person. A licker is someone who licks.