Source : Webster's Revised Unabridged Dictionary (1913)

Aponeurosis \Ap`o*neu*ro"sis\, n.; pl. {Aponeuroses}. [Gr. ?,
   fr. ? to pass into a tendon; ? from + ? to strain the sinews,
   ? sinew, tendon, nerve.] (Anat.)
   Any one of the thicker and denser of the deep fasci[ae] which
   cover, invest, and the terminations and attachments of, many
   muscles. They often differ from tendons only in being flat
   and thin. See {Fascia}.

Source : WordNet®

aponeuroses
     See {aponeurosis}

aponeurosis
     n : any of the deeper and thicker fascia that attach muscles to
         bones; resemble flattened tendons
     [also: {aponeuroses} (pl)]