That member of abnormal, unequal conjoined twins that is able to live independently and nourish the other member (parasite) of the pair. [auto- + G. sitos, food]
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au·to·site -.sīt n the larger part of a double fetus that is usu. capable of independent existence and nourishes both itself and the parasitic twin compare OMPHALOSITE
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au·to·site (awґto-sīt) [auto- + site] the larger, more nearly normal component of asymmetrical conjoined twins, to which the parasite is attached as a dependent growth. autositic adjMedical dictionary. 2011.