15-Letter Words Containing: P,R,A,X,E,S

• Any member of the Paramyxoviridae family of negative-sense single-stranded RNA viruses responsible for a number of human and animal diseases.

• The fused head and thorax of spiders and crustaceans

• extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds

• an empirical doctrine that advocates experimental principles

• an orientation that favors experimentation and innovation

• refutation by example

• a performance given extempore without planning or preparation