'allocinnamic' originates from the combination of 'allo-' meaning 'other' or 'different' and 'cinnamic,' which is derived from 'cinnamon,' referring to the aromatic compound found in cinnamon bark.

'Allocinnamic' was formed by combining the prefix 'allo-' with 'cinnamic,' which itself comes from the Latin 'cinnamomum,' referring to the spice.

Initially, it referred to a specific isomer of cinnamic acid, and this meaning has remained consistent.