Greek declension -ad

From: Joao S. Lopes
Message: 46279
Date: 2006-10-04

What's the origin of Greek declension -ad, female in dryas, naias, Pleias, Hyas, Pallas, male in Arkas ?
Is it just a consonantal suffixation of an a-theme? an as-theme?

For example
Pallas, gen. *Palla(h)os, to prevent the -ao-, insertion of a -d-?
d-feminine seem to be linked to nt-masculine themes, cf. Pallas (g. pallados) x Pallas (pallantos); Hyas x Hyas; Pleias x Atlas

Or would this d-theme be cognate of Semitic feminine suffix -t ?

dryas "dryad" could be derived from drys "oak, tree", but other names seem to be Pre-Greek.

Joao SL


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