The siliqua (plural siliquae) is the modern name given (without any ancient evidence to confirm the designation) to small, thin, Roman silver coins produced in the 4th century A.D. and later. When the coins were in circulation, the Latin word siliqua was a unit, perhaps of weight defined by one late Roman writer as one twenty-fourth of a Roman solidus.
"Siliqua vicesima quarta pars solidi est, ab arbore, cuius semen est, vocabulum tenens."A siliqua is one-twentyfourth of a solidus [coin] and the name is taken from the seed of a tree.
— Isidore of Seville, Etymologiarum libri XX, Liber XVI, 25The term siliqua comes from the siliqua graeca, the seed of the carob tree, which in the Roman weight system is equivalent to 1⁄6 of a scruple (1⁄1728 of a Roman pound or about 0.19 grams).
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