an·he·do·ni·a 
(ăn′hē-dōnē-ə)
(ăn′hē-dōnē-ə)n.
The inability to experience pleasure, as seen in certain mood disorders.
[New Latin anhēdonia : Greek an-, without; see A-1 + Greek hēdonē, pleasure; see swād- in the Appendix of Indo-European roots.]
an′he·donic (-dŏnĭk) adj.
- Aton
- Aton
- atonable
- atonal
- atonalist
- atonality
- atonally
- at once
- atone
- at one
- atoneable
- at one fell swoop
- atonement
- atoner
- at (one's) elbow
- at one's elbow
- at (one's) expense
- at one's expense
- at (one's) fingertips
- at one's fingertips
- at (one's) leisure
- at one's leisure
- at (one's) wits' end
- at one's wits' end
- at one time