"waste ground," O.E. mor "swamp," from P.Gmc. *mora- (cf. O.S., M.Du. Du. moer "swamp," O.H.G. muor "swamp," also "sea," O.N. mörr "moorland," marr "sea"), perhaps related to mere (2), or from base *mer- "to die," hence "dead land."
"North African, Berber," late 14c., from O.Fr. More, from M.L. Morus, from L. Maurus "inhabitant of Mauritania" (northwest Africa, a region now corresponding to northern Algeria and Morocco), from Gk. Mauros, perhaps a native name, or else cognate with mauros "black" (but this adj. only appears in late
Gk. and may as well be from the people's name as the reverse). Being a dark people in relation to Europeans, their name in the Middle Ages was a synonym for "Negro;" later (16c.-17c.) used indiscriminately of Muslims (Persians, Arabs, etc.) but especially those in India.