15-Letter Words Containing: O,P,O,R,E

• a performance given extempore without planning or preparation

• antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste

• a crystalline amino acid obtained from gelatin or collagen

• a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer

• The fused head and thorax of spiders and crustaceans

• radiography using X-rays and xerographic (rather than roentgenographic) techniques

• the posterior lobe of the pituitary body; primarily glandular in nature