The ciliated first-stage larva of a trematode that emerges from the egg and must penetrate into the tissues of an appropriate intermediate host snail if it is to continue its life cycle; followed by development into a mother sporocyst and by production of a number of offspring of successive larval generations. SEE ALSO: sporocyst (1). [G. meirakidion, boy]

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mi·ra·cid·i·um .mir-ə-'sid-ē-əm, .mī-rə- n, pl -cid·ia -ē-ə the free-swimming ciliated first larva of a digenetic trematode that seeks out and penetrates a suitable snail intermediate host in which it develops into a sporocyst
mi·ra·cid·i·al -ē-əl adj

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n. (pl. miracidia)
the first-stage larva of a parasitic fluke. Miracidia hatch from eggs released into water with the host's excreta. They have cilium and swim about until they reach a snail. The miracidia then bore into the snail's soft tissues and there continue their development as sporocyst.

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mi·ra·cid·i·um (mi-rə-sidґe-əm) pl. miraciґdia [Gr. meirakidion boy, young man] the first stage larva of a trematode which undergoes further development in the body of a snail.

Medical dictionary. 2011.

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  • Miracidium — Als Miracidium oder Wimpernlarve bezeichnet man ein Lebensstadium der parasitischen Saugwürmer (Trematoda) und Hakensaugwürmer (Monogenea), bei letzteren wird es allerdings meist als Oncomiracidium bezeichnet. Beispiele für Arten sind etwa die… …   Deutsch Wikipedia

  • Miracidium —   [von griechisch meirakídion »Knabe«, »Bürschchen«] das, s/...di |en, birnenförmige, bewimperte, erste Larvenform bei Saugwürmern; sie ist entweder frei schwimmend oder schlüpft bei landbewohnenden Zwischenwirten erst nach der Aufnahme des Eies… …   Universal-Lexikon

  • miracidium — MIRACÍDIUM s.m. Larvă a distomului, ciliată, având înfăţişarea unor infuzori. [pron. di um. / et. incertă]. Trimis de LauraGellner, 13.09.2007. Sursa: DN  MIRACÍDIUM s. m. larvă a distomului, ciliată, având înfăţişarea unor infuzori. Trimis de… …   Dicționar Român

  • Miracidĭum — Miracidĭum, die bewimperte Larve der Saugwürmer, s. Plattwürmer …   Meyers Großes Konversations-Lexikon

  • miracidium — ● miracidium nom masculin Première larve, microscopique, des vers trématodes, qui s installe dans le poumon d un gastropode dulcicole (limnée, planorbe) et se transforme en sporocyste …   Encyclopédie Universelle

  • Miracidium — A miracidium is a small free living larval stage of parasitic flatworms in the class Trematoda. It is released from eggs which are usually shed in the faeces of its vertebrate host. When an egg is immersed in water, its operculum liberates the… …   Wikipedia

  • miracidium — noun (plural miracidia) Etymology: New Latin, from Greek meirak , meirax youth, stripling + New Latin idium Date: 1898 the free swimming ciliated first larva of a digenetic trematode that seeks out and penetrates a suitable snail intermediate… …   New Collegiate Dictionary

  • miracidium — n.; pl. dia [Gr. dim. meirakion, young girl] (PLATYHELMINTHES: Trematoda) In Digenea, the first larval stage; a ciliated, free swimming form …   Dictionary of invertebrate zoology

  • miracidium — miracidial, adj. /muy reuh sid ee euhm/, n., pl. miracidia / sid ee euh/. the larva that hatches from the egg of a trematode worm or fluke. [1895 1900; < NL, equiv. to mirac ( < Gk meirak (s. of meîrax) boy, girl) + idium IDIUM] * * * …   Universalium

  • miracidium — n. larva that hatches from the egg of a worm …   English contemporary dictionary

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