| atlantodidymus | <embryology, obstetrics> Conjoined twins with two heads on one neck and a single body. Synonym: atlodidymus. Origin: atlanto-+ G. Didymos, twin (05 Mar 2000) |
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| atlantoepistrophic | <anatomy> Pertaining to the atlas and the axis; denoting the joint between the first two cervical vertebrae. Synonym: atlantoepistrophic, atloaxoid. (05 Mar 2000) |