Appendix:Slovene nouns/first neuter declension

The first neuter declension follow all nouns that have ending in genitive singular. Nouns can follow all accentual types and some can change gender and become masculine in dual and plural.

Basic Sample
There is distinction between hard and soft stems. Soft stems (those ending in -c, -j, -č, -ž, -š) have -e- in endings instead of -o-:

Alterations
Note: the second form is, if not otherwise denoted, in genitive singular


 * Nouns can have -s-, -t-, or -n- infix and then have no ending in nominative singular.


 * In mixed accentual types, unstressed e and o can either become or,  or , or both ( dative singular srẹ̄bru/srēbru,  dative singular mẹ̄su/mēsu).


 * Some nouns with a stressed or  can also have dual and plural forms with  or, such as , nominative plural ókna/ȏkna/ọ́kna and , nominative plural rébra/rȇbra/rẹ́bra/rẹ̑bra.


 * Nouns ending in a non-sonorant consonant and a sonorant or a sonorant followed by -r, -lj, or -nj, have a fill vowel or, if the stem ends in -j, when there is a null ending (ókno genitive plural óken, poslọ̑pje genitive plural poslọ̑pij) Nouns without a vowel in the stem add a fill vowel  in genitive dual/plural. Noun  'bottom' has an ending -ov or, as , has a fill vowel -a- (tlȁ tál/táł, dnȍ dnȍv/dán), but the -ovversion is preferred. Noun dnȍ is also irregular in locative where it is either dnȉh or dnẹ́h (dnȉh is preferred) and noun tlȁ is also irregular in locative and instrumental (nominative plural tlȁ locative plural tlẹ́h instrumental plural tlẹ́mi/tlí).


 * A few neuter s-stem nouns show the effects of the Slavic first palatalisation in the forms with the infix -es-:
 * The noun has the stem očẹ̑s-. It also has a shorter plural stem oč- when referring to human eyes. This stem is feminine rather than neuter, and follows the mixed i-stem declension.
 * The noun has the stem ušẹ́s-, with a change in accent type. The genitive plural allows both accents.
 * The noun has the stem ižẹ̑s-.


 * Noun 'firewood' is also irregular, having two forms for locative and instrumental: nominative plural dŕva locative plural drvẹ́h/dr̄vih, instrumental plural drvmí/dŕvi. The irregular forms are preferred.


 * Some nouns, such as (stem črevẹ̑s-) lose the infix in the plural: črẹ́va.

Colloquial and archaic forms

 * In the 19th century the ending -i was often used in the dative/locative singular instead of -u. This form was already included in the examples above.
 * In the 18th century the endings -ama, -am, and -ah were more common; nowadays they are purely dialectal. These forms are also already included.
 * All nowadays soft stems were up to 19th century declined as hard and that also holds true for most dialects.


 * The s-infix is often omitted in some dialects.