Apparently a primary word (compare "daughter"); a female child, or (by Hebraism) descendant (or inhabitant) -- daughter.
θύγατερ (thugater) − 1 Occurrence
θυγατέρα (thugatera) − 4 Occurrences
θυγατέρας (thugateras) − 1 Occurrence
θυγατέρες (thugateres) − 3 Occurrences
θυγατέρων (thugaterōn) − 1 Occurrence
θυγάτηρ (thugatēr) − 13 Occurrences
θυγατρὶ (thugatri) − 1 Occurrence
θυγατρὸς (thugatros) − 4 Occurrences