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

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

• attempting to justify or defend in speech or writing

• providing justification

• To categorize more specifically by placing in a subcategory.

• (grammar) To practice subcategorization.

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

• Any qualified majority, specified in advance of a vote, required for the vote to be passed

• the act of preparing a summary (or an instance thereof); stating briefly and succinctly

• 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