Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A rotating electric machine with two armatures, used to convert alternating current to direct current.

from The Century Dictionary and Cyclopedia

  • n. A combined electrical motor and generator by means of which direct current can be drawn from the source of supply at one voltage and delivered for use at another voltage. The dynamotor is used for electroplating, and has various functions in laboratories which employ electric power.

Etymologies

Greek dunamis, power; see dynamic + motor.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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