symbiotic

Of, or relating to symbiosis; living together.

A lichen is a fungus with symbiotic algae among its cells.

Orchids rely on fungi to reproduce. Their tiny seeds don't have any on-board nutrients (like beans and apples) and will not germinate until they are infected by a symbiotic fungus which supplies them with food. Known as a protocorm, this tiny orchid-fungus ball grows, turns green and eventually starts to photosynthesise.

Of a relationship with mutual benefit between two individuals, organisms, or groups.

[Israeli Prime Minister Benjamin Netanyahu's] arguably symbiotic relationship with Hamas goes back to his election in 1996, when he upset left-wing incumbent Shimon Peres following a spate of Hamas bombings, which Mr. Netanyahu said proved the peace process could not be trusted.

While pro-tech influencers like podcast host Lex Fridman have for years formed a symbiotic relationship with tech elites like Elon Musk, some firms have decided this year to cut out the middleman entirely.

A symbiotic star.