oread (n.)

a mountain nymph," "1580s, from Latin Oreas (genitive Oreadis), from Greek Oreias "mountain nymph," from oros "mountain, height," also (in Egypt) "desert," in contrast to the cultivated plain, probably from PIE *heros- "elevation." Also see -ad. Attested in English from late 14c. in Latin plural form Oreades.