One of the mysteries of the English language finally explained.
Treated as plural: a group of minute worms with no body cavity or organs other than reproductive cells, which are internal parasites of marine invertebrates and absorb dissolved nutrients directly from the host's tissues; (also mesozoa) worms of this group collectively.
Late 19th century; earliest use found in Quarterly Journal of Microscopical Science. From meso- + -zoa, after French Mésozoaires.
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