masterbatch1
/ˈmɑːstəbatʃ/ /ˈmastəbatʃ/noun
A concentrated mixture of components employed in the production of synthetic rubbers and plastics.
Origin
1930s. From master + batch.
masterbatch2
/ˈmɑːstəbatʃ/ /ˈmastəbatʃ/verb
[with object] To mix in a masterbatch.
Origin
1970s. From masterbatch. Compare earlier masterbatching.