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

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