peracephalus

per·a·ceph·a·lus

(per'ă-sef'ă-lŭs),
An omphalosite lacking head and upper limbs, and with a defective thorax; typically, the body consists of little more than pelvis and lower limbs.
[per- + G. a- priv. + kephalē, head]

peracephalus

[pur′əsef′ələs] pl. peracephali
Etymology: L, per, completely; Gk, a + kephale, not head
a fetus or individual with a malformed head.

peracephalus

(pĕr″ă-sĕf′ă-lŭs) [″ + Gr. a-, not, + kephale, head]
A parasitic placental twin. It does not contain a head or arms, and the thorax is malformed.
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