morphoplasmBiol.|ˈmɔːfəʊplæz(ə)m| [f.Gr. µορϕ-ή form + πλάσµα plasma, plasm.] The vital substance of an organic cell. 1893W. N. Parker tr.Weismann's Germ-Plasm 38, I shall..call the vital substance of the cell the ‘formative plasm’ or morphoplasm..in contrast to the idioplasm.