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Meaning of hyperpolarize

hy•per•po•lar•ize

Pronunciation: (hī"pur-pō'lu-rīz"), [key]
— v., -ized, -iz•ing.
—v.t.
  1. to increase the difference in electric potential across (a cell membrane).
—v.i.
  1. to undergo such an increase.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.