petalodont
/ˈpɛt(ə)lə(ʊ)dɒnt/Palaeontology
noun
A pavement-toothed shark of the extinct family Petalodontidae or order Petalodontiformes, having petal-shaped teeth and known from Carboniferous and Permian fossils.
adjective
Of or relating to the extinct shark family Petalodontidae or order Petalodontiformes.
Origin
Late 19th century. From scientific Latin Petalodont- (in Petalodontidae, family name; from ancient Greek πέταλον leaf + scientific Latin -odont + -idae, after Petalodus, genus name).