additive

US /ˈæd.ə.t̬ɪv/
UK /ˈæd.ə.t̬ɪv/
"additive" picture
1.

a substance added to something in small quantities to improve or preserve it

:
Many processed foods contain artificial additives.
This fuel has special additives to improve engine performance.
1.

relating to or denoting a substance added to something to improve or preserve it

:
The company specializes in additive manufacturing processes.
They are developing new additive technologies for plastics.