13-Letter Words Containing: _,O,R,X,Y

• a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive

• To introduce a hydroxyl group into a compound

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

• a group of viruses including those causing mumps and measles

• accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys