/ˈhɑpːi/, [ˈhɑ̝pːi]
AlkuperäFrom happo (“acid”) (for semantics, compare German Sauerstoff from sauer (“sour, acidic”)); coined by Finnish folk poetry researcher, translator and journalist Julius Krohn in 1862. Declension as an e-stem rather than an i-stem noun is modeled after typpi (“nitrogen”), also introduced by Krohn as an element name.
Muodothappi(nominative, singular) · hapet(nominative, plural) · happi(accusative, nominative, singular) · hapet(accusative, nominative, plural) · hapen(accusative, genitive, singular) · hapet(accusative, genitive, plural) · hapen(genitive, singular) · happien(genitive, plural) · happea(partitive, singular) · happia(partitive, plural) · hapessa(inessive, singular) · hapissa(inessive, plural) · hapesta(elative, singular) · hapista(elative, plural) · happeen(illative, singular) · happiin(illative, plural) · hapella(adessive, singular) · hapilla(adessive, plural) · hapelta(ablative, singular) · hapilta(ablative, plural)