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