TRIFURCATE
trifurcate
(verb) divide into three; “The road trifurcates at the bridge”
Source: WordNet® 3.1
Etymology
Adjective
trifurcate (not comparable)
Forked, with three tines or points.
Verb
trifurcate (third-person singular simple present trifurcates, present participle trifurcating, simple past and past participle trifurcated)
To divide or fork into three channels or branches.
Source: Wiktionary
Tri*fur"cate, Tri*fur"ca*ted, a. Etym: [L. trifurcus; tri- (see Tri-)
+ furca fork.]
Definition: Having three branches or forks; trichotomous.
Source: Webster’s Unabridged Dictionary 1913 Edition