tribrachia

tri·bra·chi·a

(trī-brā'kē-ă), Condition seen in conjoined twins in which there are only three upper limbs for the two bodies. See: conjoined twins. [tri- + G. brachiōn, arm]

tri·bra·chi·a

(trī-brā'kē-ă) Condition seen in conjoined twins when the fusion has merged the adjacent upper limbs to form a single one, so that there are only three upper limbs for the two bodies.
See also: conjoined twins[tri- + G. brachiōn, arm]

tribrachia

(trī-brā′kē-ă) The condition of having three arms.