hom Syllabification: (hom)Pronunciation: /hōm/ (also homa /ˈhōmə/, haoma /ˈhoumə/)Definition of hom noun the soma plant, a leafless vine of eastern India. Sarcostemma acidum, family Asclepiadaceae the sour, milky juice of the soma plant, consumed as a sacred drink of the Parsees. See also soma2.Origin: mid 19th century: from Persian hūm or Avestan haomahom in other Oxford dictionaries Definition of hom in the British & World English dictionary