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thermo-focal
thermo-focal adj.
Brit. 
/ˌθəːmə(ʊ)ˈfəʊkl/
, /ˌθəːmə(ʊ)ˈfəʊkl/U.S. /ˌθərmoʊˈfoʊk(ə)l/
of or pertaining to the focal length of a lens as influenced by heat./ˌθərmoʊˈfoʊk(ə)l/ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > lens > [adjective] > focal length or point
focused1784
thermo-focal1903
1903 Science 27 Feb. 333 A study of the thermo-focal changes in long focus lenses.
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