Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A ciliated larva of a digenetic trematode, which hatches from the egg and enters the first intermediate host, where it develops into a sporocyst or a redia.

from The Century Dictionary.

  • noun The free-swimming larva of the liver-fluke. The body is ciliated and the larva swims about seeking for a definite mollusk, its future host, into which it bores its way by means of the snout, which, in certain species, is armed with a stylet.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A free-living motile form of a trematode, covered with cilia, which settles in the mollusc to become a sporocyst.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[German, from Greek *meirakidion (attested in Latin as mīracidion, one in early adolescence), diminutive of meirax, young girl, young person, lad.]

Examples

  • In fresh water the eggs hatches and a free-living larval stage, called miracidium, starts its search for an appropriate intermediate snail host.

    Chapter 6

  • When in the egg stage they are at the mercy of water currents, but once they hatch into miracidium they are able to locomote using cilia.

    Platyhelminthes

  • The eggs hatch into a ciliated miracidium which actively seeks out the first host, a gastropod, penetrating its skin and metamorphosing into a saclike sporocyst.

    Platyhelminthes

  • In an internal organ of the snail (equivalent to the liver and pancreas combined) the miracidium transforms into a cercaria (the infective larval stage) in about a month.

    Chapter 6

  • Though the miracidium held inside the eggs is already well developed at this point, it does not hatch until it is ingested by an intermediate snail host.

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  • Though the miracidium held inside the eggs is already well developed at this point, it does not hatch until it is ingested by an intermediate snail host.

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  • Though the miracidium held inside the eggs is already well developed at this point, it does not hatch until it is ingested by an intermediate snail host.

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  • Though the miracidium held inside the eggs is already well developed at this point, it does not hatch until it is ingested by an intermediate snail host.

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