Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Dryădes, um (dat. Graec. dryasin, Prop. 1, 20, 12; dub. al. adryasin; cf. ib. 32 and 34), f., = Δρυάδες, wood-nymphs, dryads, Prop. 1, 20, 45; Verg. E. 5, 59; id. G. 1, 11; Ov. M. 3, 507; 6, 453 al.
In the sing., Dryas, Mart. 9, 62.