hyrna
Icelandic
    

A 3-simplex, also known as a ferflötungur, fjórflötungur, þrístrend strýta 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)
- a carton in the shape of a tetrahedron or a triangular pyramid
- (geometry, topology) a simplex
Declension
    
Derived terms
    
- mjólkurhyrna
- þríhyrna
- 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
Norwegian Nynorsk
    
    Etymology 1
    
From Middle Norwegian hyrni n, from Old Norse hyrna f, from Proto-Germanic *hurnijǭ f.
Noun
    
hyrna n (definite singular hyrna, indefinite and definite plural hyrno)
hyrna
- plural definite of hyrne n
Noun
    
hyrna f (definite singular hyrna, indefinite plural hyrner or hyrnor, definite plural hyrnene or hyrnone)
hyrna
- singular definite of hyrne
References
    
- “hyrna” in The Nynorsk Dictionary.
Old Norse
    
    Etymology
    
From Proto-Germanic *hurnijǭ, feminine diminutive of *hurną whence Old Norse horn. Ultimately from Proto-Indo-European *ḱerh₂-.
Declension
    
Related terms
    
- horn
- hyrning
Descendants
    
References
    
- “hyrna”, in Geir T. Zoëga (1910) A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press
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