This name is found only on Roman asses, semisses, and trientes.
A specimen of one of these coins is annexed, containing on the obverse the head of Jupiter, with S (the sign of Semissis), and on the reverse the prow of a ship.
William Smith. A Dictionary of Greek and Roman biography and mythology. London. John Murray: printed by Spottiswoode and Co., New-Street Square and Parliament Street. In the article on Soranus, we find: "at this present time (1848)" and this date seems to reflect the dates of works cited. 1873 - probably the printing date.