Underdeveloped twin of allantoidangiopagous twin; joined by umbilical vessels. SYN: placental parasitic twin. [omphalo- + G. sitos, food]
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om·pha·lo·site -fə-lə-.sīt n the member of a pair of conjoined twins of unequal size that is smaller and parasitic and that receives its blood supply by way of the larger twin compare AUTOSITE
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om·pha·lo·site (omґfə-lo-sīt″) [omphalo- + Gr. sitos food] an underdeveloped member of allantoidoangiopagous twins, which is joined to the more developed member (autosite) by the vessels of the umbilical cord.Medical dictionary. 2011.