【化】 impermeable graphite
nay; no; non-; nope; not; without
【医】 a-; non-; un-
appear; fully; pass through; penetrate; tell secretly
【机】 permease
black lead; graphite; plumbago; pot lead
【化】 black lead; graphite; mineral black; mineral carbon; pot lead
【医】 black leaching; graphite; plumbago