arkosePronunciation: /ˈɑːkəʊs, -z/Definition of arkose noun [mass noun] Geology a coarse-grained sandstone which is at least 25 per cent feldspar. Derivatives arkosicPronunciation: /ˌɑːkəʊsɪk, -zɪk/ adjective Origin: mid 19th century: from French, probably from Greek arkhaios 'ancient'arkose in other Oxford dictionaries Definition of arkose in the US English dictionary
