Noun
(historical) A traditional Galician unit of dry measure, equivalent to about 12–18 L depending on the substance measured.
(historical) A trapezoidal measuring cup once used for measuring ferrados of grain.
(historical) A traditional Galician unit of mass equal to the amount held by a ferrado, varying from about 12–20 kg depending on the substance measured.
(historical) A traditional Galician unit of land area reckoned as the amount needed to sow a ferrado of seed, varying from 64–725 m² in different parts of Galicia.
Source: en.wiktionary.org