(physics, archaic) A weak radioactive ray arising from the impact of cathode particles with the molecules of gas contained in an X-ray tube or with the glass walls of the tube.

plural of derma ray

(mathematics) A particular generalization of the derivative of a function between two Banach spaces.

A chronic skin disease characterised by blisters filled with watery fluid, and visually resembling herpes.

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

plural of derangement syndrome

plural of Derangement Syndrome

The acute onset of paranoia in otherwise normal and balanced people triggered by the mention of a specific topic.

A fundraising event where rubber ducks are placed in a stream or river so as to be carried by the current, the winner being the first duck to reach a designated end point.

(linguistics) The derivation of a word from another word (of a differing part of speech) without modification; anthimeria.