The form dor in the Etymologies is a misreading, see VT/45. In composition and in toponyms, the word is nevertheless reduced to Dor
Noldorin
nô
noun. thigh
rhaudh
adjective. hollow, cavernous
amon
noun. hill, steep-sided mount
amon
noun. hill
dor
noun. land, dwelling-place, region where certain people live
dôl
noun. head
dôl
noun. hill or mountain
mindon
noun. isolated hill, especially a hill with a watch tower
mindon
noun. tower
rhoss
noun. rain
rhoss
noun. rain
rosta-
verb. to hollow out, excavate
tund
noun. hill, mound
tunn
noun. hill, mound
A word for “thigh” in The Etymologies of the 1930s appearing in the (deleted) entry for the root ᴹ√ÑGŌ̆W (EtyAC/ÑGŌ̆W).