Hypertext Webster Gateway: "galleyworm"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Galley-worm \Gal"ley-worm`\, n. [Prob. so called because the
numerous legs along the sides move rhythmically like the oars
of a galley.] (Zo["o]l.)
A chilognath myriapod of the genus {Iulus}, and allied
genera, having numerous short legs along the sides; a
milliped or ``thousand legs.'' See {Chilognatha}.
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