From Proto-Indo-European *lewkós, from *lewk-.
*loukos
- white
O/ā-stem
|
masculine
|
singular
|
dual
|
plural
|
nominative
|
*lowkos
|
*lowkou
|
*lowkoi
|
vocative
|
*lowke
|
*lowkou
|
*lowkoi
|
accusative
|
*lowkom
|
*lowkou
|
*lowkons
|
genitive
|
*lowkī
|
*lowkous
|
*lowkom
|
dative
|
*lowkūi
|
*lowkobom
|
*lowkobos
|
instrumental
|
*lowkū
|
*lowkobim
|
*lowkobis
|
feminine
|
singular
|
dual
|
plural
|
nominative
|
*lowkā
|
*lowkai
|
*lowkās
|
vocative
|
*lowkā
|
*lowkai
|
*lowkās
|
accusative
|
*lowkam
|
*lowkai
|
*lowkans
|
genitive
|
*lowkās
|
*lowkous
|
*lowkom
|
dative
|
*lowkai
|
*lowkābom
|
*lowkābos
|
instrumental
|
*?
|
*lowkābim
|
*lowkābis
|
neuter
|
singular
|
dual
|
plural
|
nominative
|
*lowkom
|
*lowkou
|
*lowkā
|
vocative
|
*lowkom
|
*lowkou
|
*lowkā
|
accusative
|
*lowkom
|
*lowkou
|
*lowkā
|
genitive
|
*lowkī
|
*lowkous
|
*lowkom
|
dative
|
*lowkūi
|
*lowkobom
|
*lowkobos
|
instrumental
|
*lowkū
|
*lowkobim
|
*lowkobis
|
Declension of the comparative
|
masculine
|
singular
|
dual
|
plural
|
nominative
|
*lowkyūs
|
*?
|
*lowkyoses
|
vocative
|
*lowkyūs
|
*?
|
*lowkyoses
|
accusative
|
*lowkyosam
|
*?
|
*lowkyosans
|
genitive
|
*lowkisos
|
*?
|
*lowkisom
|
dative
|
*lowkisei
|
*?
|
*lowkisbos
|
instrumental
|
*lowkisī
|
*?
|
*lowkisbis
|
feminine
|
singular
|
dual
|
plural
|
nominative
|
*lowkyūs
|
*?
|
*lowkyoses
|
vocative
|
*lowkyūs
|
*?
|
*lowkyoses
|
accusative
|
*lowkyosam
|
*?
|
*lowkyosans
|
genitive
|
*lowkisos
|
*?
|
*lowkisom
|
dative
|
*lowkisei
|
*?
|
*lowkisbos
|
instrumental
|
*lowkisī
|
*?
|
*lowkisbis
|
neuter
|
singular
|
dual
|
plural
|
nominative
|
*lowkis
|
*?
|
*?
|
vocative
|
*lowkis
|
*?
|
*?
|
accusative
|
*lowkis
|
*?
|
*?
|
genitive
|
*lowkisos
|
*?
|
*lowkisom
|
dative
|
*lowkisei
|
*?
|
*lowkisbos
|
instrumental
|
*lowkisī
|
*?
|
*lowkisbis
|