Definition of microgroove in English:

microgroove

Syllabification: mi·cro·groove
Pronunciation: /ˈmīkrəˌɡro͞ov
 
/

noun

The very narrow groove on a long-playing phonograph record.
More example sentences
  • With Jan Peerce and Leonard Warren, she recorded an excellent Rigoletto for RCA Victor in 1950 - the first operatic recording to be released on microgroove, unless I am mistaken.

Definition of microgroove in:

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