本式ほんしき

1formal (way) ; orthodox ; regular ; proper ; real ; genuine Translated by Jiyomi
2in earnest ; serious ; proper ; full-blown (e.g. winter)

nouns which may take the genitive case particle 'no' · adjectival nouns or quasi-adjectives (keiyodoshi) · noun (common) (futsuumeishi)

JMdict entry 1822750. Source and licence.