• (a.) Having, or consisting of, tow joints.
(bi″ahr-tik´u-lāt) pertaining to or having two joints.
Bi`ar·tic'u·late adjective [ Prefix bi- + articulate .] (Zoology) Having, or consisting of, tow joints. 
biarticulate Having, or consisting of, two joints; such as the antennae of certain insects.
having two joints, as the antennae of certain insects.