The definition of a moan is a long, low sound, often due to pain.(noun)
An example of a moan is the sound that someone with a stomach ache may make.
Moan is defined as to complain or grieve about something or to utter a low, long sound of pain.(verb)
See moan in Webster's New World College Dictionary
Origin: ME mone, prob. < base of OE mænan, to complain: see mean
See moan in American Heritage Dictionary 4
Origin: Middle English mone
Origin: , from Old English *mān; see mei-no- in Indo-European roots.
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