noun (used with a singular verb)
a science concerned with bettering the condition of human beings through the improvement of their environment.

1900–05; < Greek euthēn(eîn) to be well off, prosper + -ics

euthenist [yoo-then-ist, yoo-thuh-nist] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
euthenics (juːˈθɛnɪks)
(functioning as singular) the study of the control of the environment, esp with a view to improving the health and living standards of the human race
[C20: from Greek euthēnein to thrive]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

euthenics eu·then·ics (yōō-thěn'ĭks)
The science concerned with establishing the optimum living conditions for plants, animals, or humans, especially through proper provisioning and environment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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