Seir = "hairy" or "shaggy"

 n pr m
 1) patriarch of the Horites, the inhabitants of Edom before the
    descendants of Esau, the Edomites

 n pr terr
 2) the land of Edom, south of the Dead Sea
 n pr mont
 3) a mountain range in Edom extending from the Dead Sea to the
    Elanitic Gulf
    3a) apparently also called 'Mount Seir' and extending most of the
        distance of the mountain range itself
 4) a mountain in northern Judah lying westward from Kirjath-jearim