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thermo-harden
thermo-harden v.
Brit. 
/ˌθəːməʊˈhɑːdn/
, /ˌθəːməʊˈhɑːdn/U.S. /ˌθərmoʊˈhɑrd(ə)n/
(transitive) to harden permanently by subjection to heat./ˌθərmoʊˈhɑrd(ə)n/ΘΚΠ
the world > matter > constitution of matter > hardness > make hard [verb (transitive)] > by heat
bake?c1400
thermo-harden1949
1949 R. J. W. Reynolds in J. M. Preston Fibre Science xvii. 318 The final products may be thermo-hardened by a suitable cross-linking treatment.
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