One of the mysteries of the English language finally explained.
Of or relating to the family Olenellidae of primitive Lower Cambrian trilobites.
A trilobite of the family Olenellidae.
Late 19th century; earliest use found in Benjamin Neeve Peach (1842–1926), geologist. From scientific Latin Olenellidae, family name from Olenellus, genus name (E. Billings Palaeozoic Fossils I. 11; from Olenus, genus name + -ellus) + -idae.
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