noun, plural miracidia [mahy-ruh-sid-ee-uh] .
the larva that hatches from the egg of a trematode worm or fluke.

1895–1900; < Neo-Latin, equivalent to mirac- (< Greek meirak- (stem of meîrax) boy, girl) + -idium -idium

miracidial, adjective
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World English Dictionary
miracidium (ˌmaɪrəˈsɪdɪəm)
n , pl -ia
the flat ciliated larva of flukes that hatches from the egg and gives rise asexually to other larval forms
[C20: New Latin, via Late Latin miracidion, from Greek meirax boy, girl]

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Example sentences
Within the egg a miracidium develops and, when fully developed, hatches.
The miracidium finds a suitable first intermediate host, a freshwater snail, and penetrates the foot.
Here they hatch into a free-swimming stage called a miracidium.
The miracidium swims in search of a proper second host animal, a particular type of snail.
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