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22nd Amendment an amendment to the U.S. Constitution that ensures that no person can be elected to more than two four-year terms as President of the United States. The 22nd Amendment, ratified in 1951, was passed in reaction to President Franklin D. Roosevelt's four terms in office.
acid in chemistry, any of a group of substances that usu. dissolve in water, have a sour taste, and form salts in reaction with bases. (Cf. base.) [1/7 definitions]
allergen any substance capable of causing an allergic reaction.
allergic having abnormal or disabling sensitivity to certain agents such as drugs, food, or pollen, resulting in a hypersensitive reaction upon exposure. [1/3 definitions]
anaphylaxis extreme allergic reaction to a substance, typically a foreign protein or drug, following a previous exposure to the same substance.
backlash a strong reaction against some prior development, esp. political or social change. [1/3 definitions]
blocker a drug or other substance that inhibits or prevents a biochemical reaction in an organism. [1/2 definitions]
breathless suspending or as if suspending one's breath, as in reaction to keen anxiousness or astonishment. [1/2 definitions]
carry away to cause an extreme reaction; transport; enrapture.
catalysis the introduction or intervention of a substance that causes or speeds up a chemical reaction without being affected itself. [1/2 definitions]
catalyst a substance that produces or speeds up a chemical reaction without being affected itself. [1/2 definitions]
chain-react to be part of or involved in a chain reaction.
chain reaction in physics, a self-sustaining reaction in which the particles produced by nuclear fission cause the fission of other nuclei. [2/3 definitions]
chemical a distinct substance, such as an element or molecular compound, used in or obtained through a reaction involving atomic or molecular changes. [1/3 definitions]
chemosynthesis the synthesis of organic substances by an organism using energy provided by a chemical reaction.
control rod a rod or bar in a nuclear reactor that contains a neutron-absorbing material, and that is lowered into or raised from the core to control the fission chain reaction.
counterreaction combined form of reaction.
critical in physics, of a state just preceding a nuclear reaction. [1/5 definitions]
critical mass the minimum mass of fissionable material necessary to sustain a nuclear chain reaction. [1/2 definitions]
cyanamide a caustic, white, unstable compound prepared by the reaction of calcium cyanamide with sulfuric acid and used in chemical production.
defense mechanism a physiological reaction occurring in an organism when defending itself, such as antibody production against a pathogen. [1/2 definitions]