retardencyn.
/rᵻˈtɑːd(ə)nsi/, U.S. /rəˈtɑrd(ə)nsi/, /riˈtɑrd(ə)nsi/ = retardancy n.
ΘΚΠ
the world > action or operation > difficulty > hindrance > types or manners of hindrance > [noun] > hindering or retarding > capacity to retard fire, etc.
retardance1891
retardency1939
retardancy1947
1939 C. Luckhaupt U.S. Patent 2,173,882 1/1 Fire retardency or attribute of non-support of combustion.
1987 P. A. Schweitzer What Every Engineer should know about Corrosion vi. 51 Mixing or alloying of two or more thermoplastic systems is a common practice to improve physical properties such as..flame retardency.
2002 Express (Nexis) 17 June 31 The crash worthiness, the fire retardency and the interior passenger safety significantly exceed the standards around during British Rail's era.
This is a new entry (OED Third Edition, March 2010; most recently modified version published online March 2022).
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n.1939