"Mosasaurian" is a word in ENGLISH

One who believes that eternal punishment consists in annihilation or extinction of being; a destructionist.

A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, …

One of an extinct English order of monks.

A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for …

or CLIPEUS. In old English law. A shield; metaphorically one of a no-ble family. Cigpei prostrati, noble families extinct Mat …

A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil …

One of a group of extinct reptiles having the jaws armed with a horny beak, as in turtles, and in …

Such as pro-duce or bring about the origination, transfer, or extinction of rights. They are either investitive, those by means …

One of the gigantic ostrichlike birds of the genus Aepiornis, only recently extinct. Its remains have been found in Madagascar.

The remains of an animal or plant found in stratified rocks. Most fossils belong to extinct species, but many of …

One of a family (Glyptodontidae) of extinct South American edentates, of which Glyptodon is the type. About twenty species are …

One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian …

One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian …

An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof …

Of, pertaining to, or resembling, an extinct genus of sharks (Hybodus), especially in the form of the teeth, which consist …

One of an extinct family of trees allied to the modern club mosses, and including Lepidodendron and its allies.

One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc.

Any one of several very large extinct species of wingless birds belonging to Dinornis, and other related genera, of the …

One of an extinct sect, named after Ludovic Muggleton, an English journeyman tailor, who (about 1657) claimed to be inspired.

An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.