Definition of: moan

(mōn) noun
1. A low mournful sound indicative of grief or pain.
2. A similar sound: the moan of the wind.
3. Obs. Lamentation; complaint.
—v.i.
1. To utter moans of grief or pain.
2. To make a low, mournful sound, as wind in trees.
—v.t.
3. To lament; bewail. [Cf. OE mœnan lament, moan]