asymmetrical conjoined twins, in which the parasite is an amorphous mass attached to the sacral region of the autosite.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Conjoined twins in which the parasite, attached to the buttocks of the autosite, is reduced to a formless mass or embryoma. See: conjoined twins.
[pygo- + G. a- priv. + morphē, form]
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