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Sundóma is the Quenya name of the central radical vowel in a sundocarmë, an etymological root.

In the process of a language, the sundóma took part in the following phenomena:

prefixing to a sundocarmë its sundóma, usually together with its lengthening either in the first or in the last position.
A infission
adding an a before the sundóma I creating an ohlon (diphthong):
I/Y infission
putting an i/y after the sundóma creating an ohlon (less frequently occured than the previous one):


The word sundóma means "root-vowel",[1] from sundo "root" and óma "voice".[source?]


  1. J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 105