This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. See symbiont.

n. an organism in a partnership with another such that each profits from their being together; a symbiont

"Piece of the symbiote is left with conners, he continues studying it, and using it’s unique properties devices his serum to regrow his arm."

host    parasite   

symbiosis   

witch-woman    dystonia    tatty