Sindarin 

rost

adjective. rainy

A word for “rainy” appearing as an element in the name Dimrost “Rainy Stair” (S/220; WJ/151), apparently an adjectival form of ross “rain”.

rost

rainy

rost (pl. ryst)

rost

rainy

(pl. ryst)

amrûn

sunrise

amrûn (orient, east, uprising), pl. emrŷn

amrûn

sunrise

(orient, east, uprising), pl. emrŷn