English edit

 
a penis worm Priapulus caudatus

Etymology edit

penis +‎ worm

Noun edit

penis worm (plural penis worms)

  1. Any of the marine worms of the phylum Priapulida, with a phallic shape and a spiny proboscis.
    Synonym: priapulid
    • 2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 30:
      Penis worms today use their hydrostatic skeletons to make burrows with a distinctive shape, and paleontologists have discovered similar shapes in rocks 542 million years old.

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Further reading edit