hyrna

See also: hýrna and hyrne

Icelandic

Template:jumpA 3-simplex, also known as a ferflötungur (“a tetrahedron”), fjórflötungur (“a tetrahedron”), þrístrend strýta (“a tetrahedron”) or þrístrendur píramíti (“a tetrahedron”).

Etymology

From Old Norse hyrna, from Proto-Germanic *hurnijǭ. Related to horn (“an angle, a corner”).

Pronunciation

• IPA^(key): /ˈhɪrtna/
• Rhymes: -ɪrtna

Noun

hyrna f (genitive singular hyrnu, nominative plural hyrnur)

1. a carton in the shape of a tetrahedron or a triangular pyramid
2. (geometry, topology) a simplex

Declension

declension of hyrna

f-w1	singular		plural
	indefinite	definite	indefinite	definite
nominative	hyrna	hyrnan	hyrnur	hyrnurnar
accusative	hyrnu	hyrnuna	hyrnur	hyrnurnar
dative	hyrnu	hyrnunni	hyrnum	hyrnunum
genitive	hyrnu	hyrnunnar	hyrna	hyrnanna

Derived terms

derived terms from hyrna (“a carton”)

• mjólkurhyrna

• þríhyrna

derived terms from hyrna (“a simplex”)

• hyrnuaðferð (the simplex method)
• hyrnubákn (simplicial complex)
• hyrnufruma (simplicial cell)
• hyrnukeðja (simplicial chain)
• hyrnunálgun (simplicial approximation)

• hyrnurit (simplex algorithm)
• hyrnusvipfræði (simplicial homology)
• hyrnuvörpun (simplicial mapping)
• hyrnuþyrping (simplicial complex)

See also

• ferna
• mjólkurferna
• mjólkurpoki
• þríhyrningur

Further reading

• [1]

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Norwegian Nynorsk

Noun

hyrna n

1. plural definite of hyrne

Noun

hyrna f

1. singular definite of hyrne

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Old Norse

Etymology

(deprecated template usage)

From Proto-Germanic *hurnijǭ, feminine diminutive of *hurną whence Old Norse horn. Ultimately from Proto-Indo-European *ḱerh₂-.

Noun

hyrna f

1. point of an axe-head

Declension

  Declension of hyrna (weak ōn-stem)

feminine	singular		plural
	indefinite	definite	indefinite	definite
nominative	hyrna	hyrnan	hyrnur	hyrnurnar
accusative	hyrnu	hyrnuna	hyrnur	hyrnurnar
dative	hyrnu	hyrnunni	hyrnum	hyrnunum
genitive	hyrnu	hyrnunnar	hyrna	hyrnanna

Related terms

• horn
• hyrning

Descendants

• Icelandic: hyrna f
• Middle Norwegian: hyrni n
  • Norwegian Nynorsk: hjørne, hyrne
  • Norwegian Bokmål: hjørne
• Old Swedish: hyrna
  • Swedish: hörna c
• Danish: hjørne n

References

• “hyrna”, in Geir T. Zoëga (1910) A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press