unequal conjoined twins with the parasite twin as a supernumerary limb attached to the thorax.
Unequal conjoined twins in which the parasite, often only a single upper or lower limb, is attached to the thorax of the autosite. See: conjoined twins.
[thoraco- + G. melos, limb]
thoracomelus(thō″ră-kŏm′ē-lŭs) [″ + melos, limb]
A deformed fetus with an extra leg attached to the thorax.