"forked, branching like the prongs of a fork," 1819, from Medieval Latin furcatus, from Latin furca "a two-pronged fork," a word of unknown etymology. As a verb, from 1828 (implied in furcated).
Entries linking to furcate
furcation n.
1640s, noun of action or state from stem of Medieval Latin furcatus (see furcate (adj.)).