autosite
/ˈɔːtəsʌɪt/Medicine
noun
The larger and more completely developed member of a pair of unequal conjoined twins, on which the less developed member (parasite) is dependent. In early use also: †either of a pair of equally developed conjoined twins (obsolete ).
Origin
Mid 19th century. From French autosite from ancient Greek αὐτόσιτος bringing one's own provisions from αὐτο- + σῖτος food.