Via an East Anglian dialect , from some Scandinavian (North Germanic) language, related to Danish terne, Norwegian terne, and Swedish tärna, all from Old Norse þerna, ultimately from Proto-Germanic *þewernǭ, from Proto-Indo-European *tekʷ-. Cognate with Old English stearn.
The adjective is either derived from the noun, or directly from Latin ternī; see above.
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