submillimeter

[ suhb-mil-uh-mee-ter ]

adjective

1. less than a millimeter in size:

   a submillimeter wave.

Word History and Origins

Origin of submillimeter¹

First recorded in 1950–55; sub- + millimeter

Example Sentences

The image above was constructed with longer-wavelength light, using the Atacama Large Millimeter/submillimeter Array (ALMA).

From The Daily Beast