microgroove

[ mahy-kruh-groov ]
/ ˈmaɪ krəˌgruv /

noun

a needle groove so narrow that over 200 can be cut in an inch of playing surface on a long-playing record.

Origin of microgroove

First recorded in 1945–50; micro- + groove

British Dictionary definitions for microgroove

microgroove
/ (ˈmaɪkrəʊˌɡruːv) /

noun

  1. the narrow groove in a long-playing gramophone record
  2. (as modifier)a microgroove record