deactivatev.
/diːˈaktɪveɪt/ transitive. To render inactive or less reactive; spec. to deprive of chemical action, to render less chemically reactive.
ΘΚΠ
the world > matter > chemistry > chemical reactions or processes > subject to chemical reactions or processes [verb (transitive)] > subject to named chemical reaction or process > render inactive
deactivate1938
the world > action or operation > inaction > make inactive [verb (transitive)]
unactive1639
stun1700
unmechanize1761
paralyse1764
hang1778
benumb1789
inactivate1901
disable1932
stultify1958
deactivate1970
1938 Jrnl. Chem. Soc. June 905 Just as the methyl substituent activates all positions,..so the carbethoxyl group deactivates all positions.
1947 Sci. News 5 160 This drift activates or deactivates the aromatic nucleus.
1970 J. Earl How to choose Tuners & Amplifiers i. 24 A switch for deactivating the stereo decoder on a weak stereo signal.
Derivatives
deactiˈvation n. the process or result of deactivating.
ΘΚΠ
the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > reactivity > action of rendering less reactive
deactivation1904
1904 Sci. Amer. Suppl. 20 Feb. 23523/1 He finds that the law of de-activation is still the same throughout this range of temperature.
1956 A. K. Osborne Encycl. Iron & Steel Industry 105/2 Deactivation, the process of prior removal of the active constituents, usually oxygen, from a corrosive liquid.
deˈactivator n. a substance which deactivates.
ΘΚΠ
the world > matter > chemistry > chemical substances > [noun] > substance which makes something less chemically reactive
deactivator1939
1939 Nature 29 Apr. 734/1 The stabilization of petrols by small quantities of organic compounds known as deactivators, which prevent oxidation, is an important advance.
1958 Economist 20 Dec. 1051/1 (advt.) Gum inhibitors and metal deactivators used in motor and aviation fuels to maintain quality during storage and use.
This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2018).
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