autosite

autosite /ô″təsīt/ [Gk, autos + sitos, food] , the larger, more normally formed member of unequal or asymmetric conjoined twins on whom the other smaller fetus depends for various physiological functions and for nutrition and growth. Compare parasitic fetus.autositic, adj.

Conjoined fetuses with autosite on right (Fujimori et al, 2004)