13-Letter Words Containing: A,I,Q,R,S,T,U

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

• Any solid with conventional crystalline properties but exhibiting a point group symmetry inconsistent with translational periodicity

• a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle

• an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century)

• one of the four competitions in an elimination tournament whose winners go on to play in the semifinals

• A second or subsequent acquisition.