microgroove

American  

[mahy-kruh-groov] / ˈmaɪ krəˌgruv /

noun

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

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microgroove British  

/ ˈmaɪkrəʊˌɡruːv /

noun

1. 1. the narrow groove in a long-playing gramophone record

   2. ( as modifier )

      a microgroove record

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Etymology

Origin of microgroove

First recorded in 1945–50; micro- + groove

Example Sentences

Columbia Records had introduced the long-playing microgroove disc in 1948, a breakthrough that changed the very meaning of “record.”

From The Wall Street Journal • Jan. 16, 2026

It was only with the development of microgroove technology after World War II that a new generation of cutting head came into use.

From Los Angeles Times • Jul. 21, 2017

Most people in the late 1940s were glad to see the old 78-r.p.m. disks being phased out in favor of lightweight, long-playing, superior-sounding microgroove records.

From Time Magazine Archive

But the children's market still offers more than a few moments of genuine magic on microgroove.

From Time Magazine Archive

In 2� years, he had compressed the playing time for six 78-r.p.m. records into the first 33? microgroove disk and started a multimillion-dollar industry.

From Time Magazine Archive