triprosopus

tri·pro·so·pus

(trī'prō-sō'pŭs),
Fetus with three united heads, with only parts of three faces.
[tri- + G. prosōpon, face]

triprosopus

(trī″prō-sō′pŭs) [″ + prosopon, face]
A deformed fetus with three faces.