V-beltn. a belt which is V-shaped in cross-section in order to give better traction on a pulley.
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V-belt1911
1911 C. S. LakeMotor Cyclist's Handbk. viii. 116 The most common form of transmission on a motor cycle is that of a ‘V’ belt.
1973 A. ParrishMech. Engineer's Ref. Bk. (ed. 11) xiii. 7 One of the problems associated with V belts..is the variation in velocity ratio which occurs from time to time.