Webster's English Dictionary

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testator

tes.ta.tor \'tes-.ta-t-*r, te-'sta-t-\ \te-'sta--triks\ n [ME testatour, 
   fr. AF, fr. LL testator, fr. L testatus, pp.] : a person who leaves a will 
   or testament in force at his death  - tes.ta.trix n