Justification

Anastomosis - a scientific term for the interconnection between two entities, such as vessels, channels, or cavities. Also applied to the folding of one word between parts of another, as in Joyce's "underdarkneath" in Ulysses or a vernacular phrase such as "my own self." Extended to mean the interrelation, interconnection intercommunication or intersubjectivity or persons - used thus in J. Hillis Miller's Ariadne's Thread (1992).
(Harmon and Holman, A Handbook to Literature)


I am henceforth going to be literarily correct in using anastomosis in the phrase "a whole nother thing". Good to know. Up to this point, I've just been using it ironically.