measles: [14] Measles means literally ‘spots, blemishes’. The word was originally borrowed from Middle Dutch māsel ‘blemish’, which went back to a prehistoric Germanic base *mas- ‘spot, blemish, excrescence’. The earliest English form of the word was thus maseles, and the change to measles (which began in the 14th century) may have been due to association with the now obsolete mesel ‘leper’, a descendant of Latin miser ‘wretched, unfortunate’ (source of English misery). [measles etymology, measles origin, 英语词源]