alta (1) adj. *"large, great in size" (root meaning)(ÁLAT). Alat- in Alatairë, q.v.
Quenya
Alatairë
great sea
alta
large, great in size
-úmë
large
-úmë (3) suffix "large" (of quantity)", as in liyúmë "host" (VT48:32)
alat-
large, great in size
alat- prefix "large, great in size". (ÁLAT, cf. VT45:5). In Alatairë.
úra
large
úra (2) adj. "large" (UR), probably obsoleted by #1 above
nerdo
large, strong man
nerdo noun "large, strong man" (compare nér) (VT47:33)
pol
large, big (strong)
pol (2) adj. "large, big (strong)". Since this would be the sole example of a monosyllabic Quenya adjective, it may be that Tolkien is here citing the root POL rather than a complete word. Cf. polda.
Alatairë place-name "Great Sea", name of the Western Ocean between Beleriand and Valinor, called Belegaer in Sindarin (ÁLAT, AYAR/AIR)