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miracidium Line breaks: mira|cid¦ium
Pronunciation: /ˌmʌɪrəˈsɪdɪəm/

Definition of miracidium in English:

noun (plural miracidia /ˌmʌɪrəˈsɪdɪə/)

A free-swimming ciliated larval stage in which a parasitic fluke passes from the egg to its first host, typically a snail.
Example sentences
  • Generally, host seeking by miracidia includes a complicated behavioral process that is initiated through a combination of light and gravity stimuli.
  • Not only do P. sinitsini become adults in E. symmetrica, but eggs are produced and hatch inside the daughter sporocysts, releasing free-swimming miracidia.
  • Larval stages of some medically important species include miracidium, redia, cercaria, and metacercaria.


Late 19th century: from Greek meirakidion, diminutive of meirakion 'boy, stripling'.

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