ˈyu̇rəkə̇s, yəˈrek- noun
Usage: capitalized
Etymology: New Latin, from ur- (II) + Greek echis viper — more at echis
: 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