We found one dictionary that defines the word exosymbionts:

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1. exosymbionts: Wiktionary

Opposite: endosymbionts, endobionts ▸ Words similar to exosymbionts ▸ Usage examples for exosymbionts ▸ Idioms related to exosymbionts ▸ Wikipedia articles (New!) ▸ Words that often appear near exosymbionts ▸ Rhymes of exosymbionts ▸ Invented words related to exosymbionts