- any of various unsegmented marine worms of the phylum Echiura, comprising the spoonworms.
Origin of echiurid
< New Latin Echiurida, variant of Echiura < Greek échi(s) viper + -oura neuter plural of -ouros -tailed (derivative of ourá tail); Cf. Echiurus a genus of the phylum; see -ida
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018