olfactory: [17] Olfactory means etymologically ‘making smell’. It was borrowed from Latin *olfactōrius, a derivative of the verb olfacere ‘smell’. This in turn was a blend of olēre ‘smell’ (source of English redolent and related to odour) and facere ‘make’ (source of English fact, faction, etc). => odour, redolent[olfactory etymology, olfactory origin, 英语词源]