Congenital absence of the greater part of the head with, however, the presence of a mouthlike opening. ... Origin: G. A-priv. + kephale, head, + stoma, mouth ... (05 Mar 2000) ... 
(a-sef″ә-lo-sto´me-ә) congenital absence of the head, with the mouth aperture on the upper aspect of the body.
acephalostomia The congenital absence of the head, yet with a kind of mouth on the superior aspect.