Definition of "libra"

(historical) A Roman unit of mass, usually equivalent to 327 g.

(historical) A traditional Spanish unit of mass, usually around 460 g.

(historical) A traditional Portuguese unit of mass, usually equivalent to 345 g and particularly used for trade in medicines.

(historical) Synonym of arratel, a separate Portuguese unit of mass, usually around 460 g.

(historical) Alternative spelling of libbra, a traditional Italian unit of mass.

(historical) Synonym of pound, a notional pound of silver as a money of account, especially in medieval contexts.