The phenomenon refers to the vowels of a word to be 'slid' to another vowel, usually e, drawn because of a following i (usually near the end of the word). This started to occur after the stage called "Old Sindarin".
Umlaut has a grammatical significance in Sindarin since it is how plural of nouns is formed.
The following verbs show how the vowels of the word-stems slid into e because of the affection of i.
- gonod "count" + -ia > genedia "to reckon"
- aglar "glory" + -ia > egleria "to praise"
- sad + -ia > seidia- "to set aside"
- See also: Sindarin#Pluralization
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