submillimeter

/ˌsʌbˈmɪləˌmitər/
adjective
  1. Smaller than one millimeter; measured in fractions of a millimeter.
    • The surgeon used submillimeter precision to perform the delicate eye operation.
    • The printer can produce submillimeter details in its 3D models.
    • Submillimeter waves are used in astronomy to study cold dust in space.
Synonyms