'aminoid' originates from the combination of 'amino' and the suffix '-oid', where 'amino' refers to the amino group in chemistry, and '-oid' means 'resembling or like'.

The term 'aminoid' was formed by combining 'amino' with the suffix '-oid' to describe substances resembling or related to amino groups.

Initially, it meant 'resembling an amine', and this meaning has largely remained the same in modern usage.