'arenaceousness' originates from English, specifically the adjective 'arenaceous' combined with the noun-forming suffix '-ness', where 'arenaceous' derives from Latin 'arena' meaning 'sand' and '-ness' meant 'state or condition'.

'arenaceous' changed from Latin 'arenaceus' (or from Latin 'arena') through Medieval Latin and later English into the adjective 'arenaceous', and English formed the modern noun 'arenaceousness' by adding the native suffix '-ness'.

Initially, it meant 'pertaining to or consisting of sand', but over time it evolved into the noun meaning 'the quality or state of being sandy'.