One of the mysteries of the English language finally explained.
Used in the genitive to designate species and varieties of animal collected or described by Étienne or Isidore Geoffroy Saint-Hilaire, or named in their honour.
Early 19th century; earliest use found in Edward Griffith (1790–1858), naturalist. From the name of Étienne GeoffroySaint-Hilaire and his son Isidore, both French zoologists.
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