13-Letter Words Containing: R,R,I,N

• a drug used to reduce stress or tension without reducing mental clarity

• a drug used to reduce stress or tension without reducing mental clarity

• To establish a hierarchy.

• To arrange in a hierarchy.

• bring outside the body for surgery, of organs

• make external or objective, or give reality to

• an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)

• red pigment in red algae

• the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst

• remove carbon from (an engine)