submillimeter

adjective sub·mil·li·me·ter \ ˌsəb-ˈmi-lə-ˌmē-tər \

Definition of submillimeter

: being less than a millimeter in diameter or wavelength
  • a submillimeter particle
  • a submillimeter radio wave

First Known Use of submillimeter

1954

in the meaning defined above

See Words from the same year
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