1. Any marine worm of the phylum Echiura, characterized by an unsegmented body and a proboscis-like appendage.
Usage: zoology; technical

1. Of, relating to, or belonging to the phylum Echiura or its members.
Usage: zoology; technical

Examples

• The echiuroid uses its proboscis to feed on organic matter on the ocean floor.
• Echiuroid worms are found in marine sediments worldwide.
• Scientists classify echiuroids as a distinct phylum separate from annelids.
• The echiuroid body plan is adapted for burrowing in soft substrates.
• Researchers study echiuroid larvae to understand early marine development.