'Foison' definitions:

Definition of 'Foison'

From: GCIDE

Foison \Foi"son\, n. [F. foison, fr. L. fusio a pouring, effusion. See Fusion.] Rich harvest; plenty; abundance. [Archaic] --Lowell. [1913 Webster]
That from the seedness the bare fallow brings To teeming foison. --Shak. [1913 Webster]