crossing; intersection; (genetic) crossing over
three-pronged fork; trident; trifurcate; three-pronged; three-way (e.g. outlet)
three-way junction; three-way intersection
five-forked road; five-road junction
optic chiasma; optic chiasm
optic chiasma; optic chiasm
dichotomous; furcate; forked
frog; fourchette; pad in a horse's hoof that acts as a shock absorber