Source : Webster's Revised Unabridged Dictionary (1913)

Myalgia \My*al"gi*a\, n. [NL., fr. Gr. ? muscle + ? pain.]
   (Med.)
   Pain in the muscles; muscular rheumatism or neuralgia.

Source : WordNet®

myalgia
     n : pain in a muscle or group of muscles [syn: {myodynia}]