hydras

Small freshwater polyps with a tubular body and tentacles, known for regeneration.

"Scientists studied the hydras' remarkable regenerative abilities."

Plural of Hydra, a mythical multi-headed serpent that regrows heads when cut.

"Ancient heroes often battled fearsome hydras."

Plural of hydra, referring to persistent, multi-faceted problems that multiply when tackled.

"The economic challenges proved to be hydras."