Where does “ryadis” come from?

ryadis (Latin) comes from Ancient Greek δρυάς, from Ancient Greek δρῦς, from Proto-Indo-European dóru, from Proto-Indo-European drew- — hard, firm, strong, solid; hard, fast; tree.

ryadis (Latin): dryad

Definitions

dryad

Ancestry of “ryadis”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δρυάς	dryad
2	Ancient Greek	δρῦς	tree, timber; oak
3	Proto-Indo-European	dóru	tree
4	Proto-Indo-European	drew-	hard, firm, strong, solid; hard, fast; tree

Every word from Proto-Indo-European drew- →Every word from Proto-Indo-European dóru →Every word from Ancient Greek δρῦς →