Source : Webster's Revised Unabridged Dictionary (1913)

Bioplast \Bi"o*plast\ (-pl[a^]st), n. [Gr. bi`os life +
   pla`ssein to form.] (Biol.)
   A tiny mass of bioplasm, in itself a living unit and having
   formative power, as a living white blood corpuscle; bioblast.