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Meaning of in terrorem clause

in ter•ro'rem clause"

Pronunciation: (in te-rôr'em, -rōr'-), [key]
— Law. Law.
  1. a clause in a will stating that a beneficiary who contests the will shall lose his or her legacy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.