Sindarin 

Tol-in-Gaurhoth

noun. isle of werewolves

toll (“island”) + in (pl. gen. article) + gaur (“werewolf”) + hoth (class plural suffix) #[HKF] with collective plurals ending in -hoth, the article can be optionally singular, cf. Naur dan i ngaurhoth.

Sindarin [Tolkiendil] Group: Tolkiendil Compound Sindarin Names. Published by

tol-in-gaurhoth

place name. Isle of Werewolves

The name of Tol Sirion after it was inhabited by Sauron and his minions, translated “Isle of Werewolves” (S/156), a combination of tol(l) “island”, the plural in of the definite article i and the class-plural of gaur “werewolf” using the suffix hoth “host” (SA/gaur, hoth).

Conceptual Development: In Silmarillion drafts from the 1930s, this name was Tol-na-Gaurhoth (SM/311, LR/284).

Elements

WordGloss
tol(l)“island, (high steep-sided) isle”
i“the”
gaur“werewolf”
hoth“host, horde, host, horde, [N.] crowd; group plural; [ᴱN.] folk, [G.] people; †army”
Sindarin [LBI/Tol-in-Gaurhoth; LR/300; LT2I/Tol-in-Gaurhoth; MRI/Tol-in-Gaurhoth; S/156; SA/gaur; SA/hoth; SI/Tol-in-Gaurhoth; UT/054; UTI/Tol-in-Gaurhoth; WJ/054; WJI/Tol-in-Gaurhoth] Group: Eldamo. Published by