ˌplu̇rəˈkan(t)thəs noun
Usage: capitalized
Etymology: New Latin, from pleur- + -acanthus
: a genus (the type of the family Pleuracanthidae) of Paleozoic sharks of the Carboniferous and Lower Permian of Europe and No. America having a subterminal mouth, long dorsal fin, and a strong serrated spine on the nape