Merriam-Webster's Collegiate Dictionary:
-plastic
adjective
combining form
Etymology:
Greek
-plastikos,
from
plassein
1.
developing
;
forming
Example:
thrombo
plastic
2.
of or relating to (something designated by a term ending in
-plasm, -plast, -plasty,
or
-plasy
)
Example:
homo
plastic
Example:
neo
plastic