subunit

/ˈsʌbˌjunɪt/
noun
  1. A smaller part that is part of a larger unit or system.
    • The military unit was broken down into subunits for the training exercise.
    • The company is divided into several subunits, each responsible for a different product.
    • Each protein is made of smaller subunits called amino acids.
Antonyms
What does "subunit" mean? | whatsthatwordmean | whatsthatwordmean