triform

or tri·formed

[trahy-fawrm]
|

adjective

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

Origin of triform

1400–50; < Latin triformis. See tri-, -form
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for triform

Historical Examples of triform