"world inhabited by men, in Gmc. cosmology (opposed to
Asgard, the abode of the gods), 1882, from O.N.
miðgarðr, from
mið "mid" (see
mid) + P.Gmc.
*gardoz "enclosure, tract" (see
yard (1)). The O.E. cognate was
middangeard, which was later folk-etymologized as
middle earth.