Hypertext Webster Gateway: "commutator"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Commutator \Com"mu*ta`tor\, n. (Elec.)
A piece of apparatus used for reversing the direction of an
electrical current; an attachment to certain electrical
machines, by means of which alternating currents are made to
be continuous or to have the same direction.
From WordNet (r) 1.7 (wn)
commutator
n : switch for reversing the direction of an electric current
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