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microgroove

[ mahy-kruh-groov ]
/ ˈmaɪ krəˌgruv /
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noun
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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Origin of microgroove

First recorded in 1945–50; micro- + groove
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

British Dictionary definitions for microgroove

microgroove
/ (ˈmaɪkrəʊˌɡruːv) /

noun
  1. the narrow groove in a long-playing gramophone record
  2. (as modifier)a microgroove record
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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