One of the mysteries of the English language finally explained.
A stonefly of the family Perlidae, comprising common stoneflies.
Belonging to or relating to the family Perlidae.
Late 19th century; earliest use found in American Naturalist. Either from scientific Latin Perlidae, family name (1835 or earlier; from Perla, genus name + -idae; compare earlier Perlariae: see perlarian [adjective]), or directly from Perla, genus name + -id. With use as noun compare earlier perlarian, and also French perlides, plural noun. With use as adjective compare earlier perlarious, and slightly later perlarian.
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