• WordNet 3.6
    • n euthenics the study of methods of improving human well-being and efficient functioning by improving environmental conditions
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In literature:

While some euthenic measures are eugenically evils, even if necessary ones, it must not be inferred that all euthenic measures are dysgenic.
"Applied Eugenics" by Paul Popenoe and Roswell Hill Johnson
In another hundred years, then, Euthenics may give place to Eugenics, and the better race of men become an actuality.
"Euthenics, the science of controllable environment" by Ellen H. Richards