'anerotic' originates from Greek, specifically the prefix 'an-' meaning 'not' and 'erotic' from 'eros' meaning 'sexual love'.

'anerotic' was formed in modern English by combining the Greek-derived prefix 'an-' with 'erotic', and eventually became the modern English word 'anerotic'.

Initially, it meant 'not erotic' or 'lacking sexual desire', and this meaning has remained consistent in modern usage.