microgroove

microgroove

[mahy-kruh-groov]
noun
a needle groove so narrow that over 200 can be cut in an inch of playing surface on a long-playing record.

Origin:
1945–50; micro- + groove

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World English Dictionary
microgroove (ˈmaɪkrəʊˌɡruːv)
 
n
a.  the narrow groove in a long-playing gramophone record
 b.  (as modifier): a microgroove record

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