(immunology) Causing an immunological reaction

(organic chemistry) The disproportionation of an aldehyde into an alcohol and a carboxylic acid.

(organic chemistry) An organic reaction which condenses aldehydes (or ketones) with α-halo esters, using a metallic zinc to form β-hydroxy-esters.

Quality of being reactionary.

plural of reactogenicity

A form of nuclear reactor using spherical fuel elements which are individually processed and fed through the reactor.

(organic chemistry) A class of reaction in which a bond (typically a double bond) is broken and a small molecule (such as carbon monoxide) is inserted in its place

(immunology) A hypersensitivity reaction involving the in situ formation of antigen/antibody complexes after the intradermal injection of an antigen.

plural of Arthus reaction

(psychology, physiology) A person whose blood pressure and heart rate increase abnormally in response to stress.