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Definition 2025

siur

siur

See also: siúr

Old Irish

Noun

siur f ‎(genitive sethar, nominative plural sethir)

sister
kinswoman, female relation

Declension

Feminine r-stem
	Singular	Dual	Plural
Nominative	siur	siair^L, sieir^L	sethir
Vocative	siur	siair^L, sieir^L	sethra^H
Accusative	siair^N, sieir^N	siair^L, sieir^L	sethra^H
Genitive	sethar	sethar^L	sethar^N
Dative	siair^L, sieir^L	sethraib	sethraib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

Derived terms

Descendants

Irish: siúr, deirfiúr
Manx: shuyr
Scottish Gaelic: piuthar

Mutation

Old Irish mutation
Radical	Lenition	Nasalization
siur	phiur, fiur	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

References

“siur” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.

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