Definition of -ster in English:

-ster

suffix

1Denoting a person engaged in or associated with a particular activity or thing: maltster songster
2Denoting a person having a particular quality: youngster

Origin

Old English -estre, -istre, etc., of Germanic origin.

Definition of -ster in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict