（*Ptw=|os), a son of Athamas and Themisto, from whom mount Ptoum and the sanctuary of Apollo, which was situated upon it, were believed to have derived their name. (Paus. 2.23.3; Apollod. 1.9.2.) Ptous also occurs as a surname of Apollo. (Paus. 4.32.5, 9.23.3.) [L.S]
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.