soffit (n.)youdaoicibaDictYouDict[soffit 词源字典]
architectural term referring to under-faces, 1610s, from Italian soffita, fem. of soffitto "ceiling," noun use of adjective meaning "fixed beneath," from Vulgar Latin *suffictus "fastened below," from Latin suffixus (see suffix (n.)).[soffit etymology, soffit origin, 英语词源]