atlantodidymus

at·lan·to·did·y·mus

(at-lan'tō-did'ē-mŭs),

Conjoined twins with two heads on one neck and a single body.

Synonym(s): atlodidymus

[atlanto- + G. didymos, twin]

atlantodidymus

(ăt-lan″tō-did′ĭ-mŭs) [ atlanto- + didymus]

Conjoined twins with one body and two heads.