The Collaborative International Dictionary of English v.0.48:

Euplastic \Eu*plas"tic\, n. (Med.)
   Organizable substance by which the tissues of an animal body
   are renewed.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Euplastic \Eu*plas"tic\, a. [Pref. eu- + -plastic.] (Med.)
   Having the capacity of becoming organizable in a high degree,
   as the matter forming the false membranes which sometimes
   result from acute inflammation in a healthy person.
   --Dunglison.
   [1913 Webster]