'arenic' originates from Latin, specifically the word 'arena,' where 'arena' meant 'sand'.

'arenic' changed from Late Latin or New Latin forms such as 'arenicus' and from adjective forms like 'arenaceus', and eventually became the modern English word 'arenic'.

Initially, it meant 'of or pertaining to sand,' and over time it has retained this meaning in modern usage, especially in technical contexts.