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an·he·do·ni·a

(ăn′hē-dōnē-ə)

The inability to experience pleasure, as seen in certain mood disorders such as depression.

[New Latin anhēdonia : Greek an-, without; see A-¹ + Greek hēdonē, pleasure; see swād- in the Appendix of Indo-European roots.]

an′he·donic (-dŏnĭk) adj.

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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