Definition of Urechis
: a genus (the type of the family Urechidae) of large echiuroid worms which are common in mud along the California seacoast and in which a circulatory system is completely lacking so that the blood corpuscles float free in the coelomic fluid
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Origin and Etymology of urechis
New Latin, from 2ur- + Greek echis viper — more at echis
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