plural of Ripperologist

(archaic, virology) Any of the former family Papovaviridae, now split into the Papillomaviridae and Polyomaviridae families, of viruses that cause papillomas or polyomas in animals.

plural of troll army

(geology) Of a geologic epoch within the Permian period from about 299 to 270 million years ago; marked by the appearance of beetles and flies.