One of the mysteries of the English language finally explained.
Treated as plural. The ciliated larvae (collectively) of certain polychaete worms, characterized by one or more rows of cilia encircling the middle of the body.
Late 19th century; earliest use found in American Naturalist. From scientific Latin Mesotrocha, former genus name from meso- + ancient Greek τροχός wheel, disc + -a.
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