Lewis Short
pīsum | pīsa, ae (noun F.n) = πισόν: (late Lat. collat. form , , f., Apic. 5, 4; Pall. 11, 14), n.
* A species of leguminous plant, pease, the pea, Col. 2, 10, 4; Plin. 18, 12, 31, § 123; 18, 12, 33, § 125.
Charlton T. Lewis, Charles Short, A Latin Dictionary