The Collaborative International Dictionary
Periplast
Periplast \Per"i*plast\, n. [Pref. peri- + Gr. ? to mold, form.]
(Biol.)
Same as Periblast. -- Per`i*plas"tic, a.
--Huxley.
Wiktionary
periplast
n. (context biology English) (alternative form of periblast English).