microgroove

 [mahy-kruh-groov]  

mi·cro·groove

   [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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Microgroove is always a great word to know.
So is ninnyhammer. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Collins
World English Dictionary
microgroove (ˈmaɪkrəʊˌɡruːv)
 
—n
a.  the narrow groove in a long-playing gramophone record
 b.  (as modifier): a microgroove record

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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