mucus: [17] Mucus was borrowed from Latin mūcus ‘nasal mucus’, which was related to two ancient verbs for ‘blow the nose’: Greek mússesthai and Latin ēmungere. The homophonic adjectival derivative mucous [17] (as in mucous membrane) comes from Latin mūcōsus. Related forms to have reached English are mucilage [14], from the late Latin derivative mūcilāgō, and moist. => moist, mucilage
