Dictionary![]() ![]() to•ka•makPronunciation: (tō'ku-mak", tok'u-), [key] —n. Physics. a type of experimental nuclear fusion reactor in which a plasma of atoms circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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