Quenya/U-stems

Nouns in -o that keep -o in all cases
They are declined as follows (we use carpo "frog"):

The u-duals in this group are declined as follows (we use ondo "stone"):

Nouns in -u that keep -u in all cases
There also exist words that end in the nominative in –u, these are however not U-stems. They differ from the U-stems in the nominative and the genitive plural. These nouns due to retaining the –u, the dual forms are always distinguished with the  –t dual form.

They are declined as follows (we use heru "lord"):

Nouns in -o with a U-stem
These are the real U-stems. But there are two exceptional categories: the nouns in -co and the nouns in  -ngo.

The others are declined as follows (we use malo,  malu- "pollen"). Note that these nouns don't follow the normal rule for the formation of the plural: they get -i as extension instead of the  -r that ordinarily follows vowels.

The u-duals in this group are declined as follows (we use sito,  situ- "habit"):

Note that these forms are, except for the nominative, all equal to the singular.

The noun tuo "muscle" behaves rather strangely because its Old-Elvish stem was  'túu'-. This long ú appears when the ending begins in a single consonant; when the ending starts in a consonant cluster or a vowel, we find  u instead of  ú, e.g.
 * Dative singular: tún


 * Ablative singular: tullo

U-stems in -co
The special feature here is that the combination cui changes in  qui. As an example we look at urco,  urcu- "bogey":

The u-duals are just as in the example of sito, except for the nominative, all equal to the singular.

Two nouns behave irregularly:
 * rauco "demon" is only a U-stem in the singular, partitive plural and dual. The plural is formed with the stem rauca-.
 * telco "leg, stem" is only a U-stem in the plural and the dual. The singular and partitive plural are formed with the stem telco- (see above for nouns that end in  -o).

U-stems in -go
The special feature here is that the combination ngu +  i changes in  ngwi. As an example we look at ango,  angu- "snake":

The u-duals are just as in the example of sito, except for the nominative, all equal to the singular.

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