iernagium
Could not find Ierna in Logeion dictionaries. Looking for closest alphabetic form.
Ivernagium, frumentum hyemale. Charta Guill. comit. Nivern. ann. 1165. inter Probat. Hist. Autiss. pag. 22. col. 2 :
Salvamentum est mina avenæ in ochia,
et duo denarii, et unus panis Jernagii. Vide Ibernagium.