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The Collaborative International Dictionary
Dimidiating

Dimidiate \Di*mid"i*ate\, v. t. [imp. & p. p. Dimidiated; p. pr. & vb. n. Dimidiating.]

  1. To divide into two equal parts. [Obs.]
    --Cockeram.

  2. (Her.) To represent the half of; to halve.

Wiktionary
dimidiating

vb. (present participle of dimidiate English)