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Meaning of poll evil

poll' e"vil

Pronunciation: (pōl), [key]
— Vet. Pathol. Vet. Pathol.
  1. an acute swelling on the top of the head of a horse originating in an inflamed bursa that underlies the great neck ligament there.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.