symbiont

plural symbionts

1. biologyAn organism that lives in a symbiotic relationship.

   It had been known that sponges somehow took in dissolved organic matter, but it remained unclear whether they could do it on their own or needed help from their bacterial symbionts.

   2019 December 9, JoAnna Klein, “Seawater Is Filled With a Sugary Feast. Here’s How Sponges Eat It.”, in The New York Times, →ISSN

   1 more example

   The close analogies between DNA-containing eukaryotic cell organelles and microbial symbionts require revision of classic cell theory, wrote Scwemmler and Schenk (1980) on introducing the field of endocytobiology.

   1991, Lynn Margulis, René Fester, Symbiosis as a Source of Evolutionary Innovation

   Synonyms: symbiote