ˌ ̷ ̷ ̷ ̷ˈsidēəm noun
( plural miracid·ia -ēə)
Etymology: New Latin, from Greek meirak-, meirax girl, boy + New Latin -idium — more at marry
: 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