ferreousyoudaoicibaDictYouDict[ferreous 词源字典]
"Of or relating to iron; consisting of or containing iron. Occasionally: specifically ( Chemistry ) = ferrous", Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From classical Latin ferreus made of iron, of or characteristic of iron, iron-barred, ironclad, having the nature of iron, hard-hearted, untiring, inexorable, shameless, brazen, in scientific Latin also resembling the colour of polished iron + -ous.[ferreous etymology, ferreous origin, 英语词源]