Source : Webster's Revised Unabridged Dictionary (1913)

Egremoin \Eg"re*moin\, n. [See {Agrimony}.]
   Agrimony ({Agrimonia Eupatoria}). [Obs.] --Chaucer.

Source : WordNet®

Agrimonia eupatoria
     n : erect perennial Old World herb of dry grassy habitats [syn:
         {harvest-lice}]