or tri·formed

  1. formed of three parts; in three divisions.
  2. existing or appearing in three different forms.
  3. combining three different forms.

Origin of triform

1400–50; < Latin triformis. See tri-, -form Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for triform

Historical Examples of triform