A terminal element in some biological words, denoting any primitive living unit or cell: as, bioplast, protoplast, etc.(noun)
The Century Dictionary (Public Domain)
Use "plast" in a sentence
"Michael Jackson flies to Italy to escape new plast ..."
"BLITZER: Another key Republican also still opposed to the president's recovery plan, despite hints this plast week of improvement in areas like housing."
"The crate, except for a thin layer of plast raw across the bottom, was empty."