From The Collaborative International Dictionary of English v.0.48: Atter \At"ter\, n. [AS. [=ae]tter.] Poison; venom; corrupt matter from a sore. [Obs.] --Holland. [1913 Webster]
Atter \At"ter\, n. [AS. [=ae]tter.] Poison; venom; corrupt matter from a sore. [Obs.] --Holland. [1913 Webster]