trichotomous

adjective
tri·​chot·​o·​mous | \trī-ˈkä-tə-məs \

Definition of trichotomous 

: divided or dividing into three parts or into threes trichotomous branching

Other Words from trichotomous

trichotomously adverb

First Known Use of trichotomous

1800, in the meaning defined above

History and Etymology for trichotomous

Late Greek trichotomein to trisect, from Greek tricha in three (akin to treis three) + -tomein (akin to temnein to cut) — more at three, tome

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The first known use of trichotomous was in 1800

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