ultrafine

From ultra- +‎ fine.

ultrafine (comparative more ultrafine, superlative most ultrafine)

1. (of particles) Very fine.
   • 2007 September 11, John Markoff, “Redefining the Architecture of Memory”, in The New York Times‎^[1], archived from the original on 9 November 2020:

     His idea is to stand billions of ultrafine wire loops around the edge of a silicon chip — hence the name racetrack — and use electric current to slide infinitesimally small magnets up and down along each of the wires to be read and written as digital ones and zeros.

• flauntier, nifuratel

• IPA^(key): /yl.tʁa.fin/
• Homophone: ultrafines

ultrafine

1. feminine singular of ultrafin