rotary con verter


turning or capable of turning around on an axis, as a wheel.
taking place around an axis, as motion.
having a part or parts that turn on an axis, as a machine.
noun, plural rotaries.
a rotary device or machine.
Chiefly Northeastern U.S. traffic circle.
Also called rotary converter. Electricity, synchronous converter.
(initial capital letter) Rotary Club.

1725–35; < Medieval Latin rotārius (adj.), equivalent to Latin rot(a) wheel + -ārius -ary

unrotary, adjective Unabridged

synchronous converter

noun Electricity.
a synchronous machine for converting alternating current to direct current, or vice versa, in which the armature winding is connected to collector rings and to a commutator.
Also called rotary, rotary converter. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotary (ˈrəʊtərɪ)
1.  of, relating to, or operating by rotation
2.  turning or able to turn; revolving
n , -ries
3.  a part of a machine that rotates about an axis
4.  (US), (Canadian) a roundabout (for traffic)
[C18: from Medieval Latin rotārius, from Latin rota a wheel]

synchronous converter
a synchronous machine that converts alternating current to direct current, or vice versa

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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Word Origin & History

1731, from M.L. rotarius "pertaining to wheels," from L. rota "wheel," from PIE base *roto- "to run, to turn, to roll" (cf. Skt. rathah "car, chariot;" Avestan ratho; Lith. ratas "wheel," ritu "I roll;" O.H.G. rad, Ger. Rad, Du. rad, O.Fris. reth, O.S. rath, O.Ir. roth, Welsh rhod "carriage wheel").
The international service club (founded by Paul P. Harris in Chicago in 1905) so called from the practice of clubs entertaining in rotation. Hence Rotarian (1911).
Online Etymology Dictionary, © 2010 Douglas Harper
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