Definitions

1. noun

The larval stage of certain parasitic flatworms, especially those of the class Trematoda, which are free-swimming and develop into cercariae before infecting a host.

“The aquatic plant provided a habitat for the miracidia of the parasitic flatworm, allowing them to feed and grow before infecting a host.”

2. plural noun

The larvae of certain parasitic flatworms, especially those of the class Trematoda, that are free-swimming and develop into cercariae before infecting a host.

“Miracidia are highly infective and can cause significant damage to aquatic ecosystems.”