noun (used with a singular verb)
the branch of psychology that deals with pleasurable and unpleasurable states of consciousness.

1860–65; see hedonic, -ics

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World English Dictionary
hedonics (hiːˈdɒnɪks)
1.  the branch of psychology concerned with the study of pleasant and unpleasant sensations
2.  (in philosophy) the study of pleasure, esp in its relation to duty

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Main Entry:  hedonics
Part of Speech:  n
Definition:  See hedonology
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American Heritage
Medical Dictionary

hedonics he·don·ics (hĭ-dŏn'ĭks)
The branch of psychology that studies pleasant and unpleasant sensations and states of mind.

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