indyonoun "grandchild, descendant" (ÑGYŌ/ÑGYON - read *inyo in Noldorin Quenya, which dialect changed ndy to ny? Cf. Quenya for Quendya.) In the pre-classical Tengwar system presupposed in the Etymologies, indyo was also the name of tengwa #17 with overposed dots to indicate following y(VT46:4), the whole symbol having the value ndy.
-inen pl. instrumental ending. In ómainen(WJ:391)
inga (1) noun "top, highest point" (PM:340), "only applied to shapes pointing upwards...[it] referred primarily to position and could be used of tops relatively broad". Compounded in the nouns aldinga "tree-top" (alda + inga) (VT47:28), ingaran “high-king” (PM:340)
inga (2) adj. "first" (ING)
ingarannoun "high-king" (PM:340), compounded from inga and aran
Ingolënoun "Science/Philosophy" as a whole (PM:360; WJ:383 has ingolë ["iñgole"], glossed "lore". In the Etymologies, stem ÑGOL, the word ingolë was marked as archaic or poetic and is glossed "deep lore, magic").
ingólemonoun "one with very great knowledge, a 'wizard' ", applied only to great sages of the Eldar in Valinor, like Rúmil (PM:360)
ingolmonoun "loremaster" (WJ:383)
Ingolondë place-name "Land of the Gnomes" (Beleriand, "but before applied to parts of Valinor") (ÑGOLOD)