Parabiosis

Parabiosis is the condition of more than one living organism joined ..., with ... circulatory fluids being exchanged among the parabionts.

2017 Cosima in "Manacled Slim Wrists", Orphan Black Mud, parabiosis means that he is processing young blood and transfusing it.

Conjoined identical twins... could be thought of as parabionts.

1873, Walter Moxon, Guy's Hospital Reports, 3rd series, Vol XVIII https://archive.org/details/3reportsguy18guysuoft …the fever sperm coming into ... the living frame ... is able to create a sort of other life or parabiosis within it ....