Source : Webster's Revised Unabridged Dictionary (1913)

Hypermetamorphosis \Hy`per*met`a*mor"pho*sis\, n. [Hyper- +
   metamorphosis.] (Zo["o]l.)
   A kind of metamorphosis, in certain insects, in which the
   larva itself undergoes remarkable changes of form and
   structure during its growth.