simple past tense and past participle of derange

Disturbed or upset, especially mentally. / Insane.

One who deranges.

plural of deranger

Third-person singular simple present indicative form of derange

present participle of derange

(transitive, chiefly passive) To cause (someone) to go insane or become deranged. / (transitive) To cause disorder in (something); to distort from its ideal state.

plural of derangement

The property of being deranged. / An act or instance of deranging. / (mathematics, combinatorics) A permutation of a set such that no element is in its previous position.

(pathology) One of three mechanical syndromes in the McKenzie method proposed in 1981 by the New Zealand physical therapist Robin McKenzie.