phacopid
/ˈfakə(ʊ)pɪd/Palaeontology
adjective
Of or relating to the family Phacopidae of trilobites, the members of which had large compound eyes and a rounded glabella which widened frontwards.
noun
A trilobite of the family Phacopidae.
Origin
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.