betamax

Main Entry:  Betamax
Part of Speech:  n
Definition:  the first home videocassette record/playback tape format, created by Sony and using half-inch wide magnetic tape, now obsolete
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Etymonline
Word Origin & History

Betamax
1975, proprietary name (Sony), from Japanese beta-beta "all over" + max, from Eng. maximum.
Online Etymology Dictionary, © 2010 Douglas Harper
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