One of the mysteries of the English language finally explained.
Of or relating to the family Phacopidae of trilobites, the members of which had large compound eyes and a rounded glabella which widened frontwards.
A trilobite of the family Phacopidae.
Early 20th century; earliest use found in Ottawa Naturalist. From scientific Latin phacop-, taken as stem of Phacops, genus name (H. F. Emmrich De Trilobitis 16; from ancient Greek ϕακός lens + ὤψ face, eye: see -ops) + -id, after Phacopidae, family name.
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