Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
EE, v.2 To ferment, effervesce, “work” (of barm on ale). Gen. in the ppl. form eean or eenan (Ork. 1929 Marw.; Ork.2 1948). [i:((n)ən)]
[Norw. dial. eea, ia, ida, to ferment, froth (Aasen). Icel. iða, id.]