'amboceptoid' originates from the combination of 'amboceptor' and the suffix '-oid', where 'amboceptor' refers to an antibody that binds to both an antigen and a complement component, and '-oid' means 'resembling or like'.

The term 'amboceptor' was coined in the early 20th century, and 'amboceptoid' was later derived to describe substances resembling amboceptors.

Initially, it referred to substances resembling amboceptors, and this meaning has largely remained the same in modern usage.