In epic and tragedy the headword adjective is often applied to women, and in other genres to land or territory. At the similar entry in Hesychius (delta2212: adjective only) Latte tentatively suggests that the source is Euripides, Hecuba 478: there the chorus of captive Trojan women bemoan their own land as dori/kthtos.
The present headword phrase as a whole (with which cf. generally the one added to delta 1394) is presumably quoted from somewhere, unidentifiable.