PREFIX
con- with, together
ex- out, away, from
se- apart

ROOT
clud/clus close
herbi grass
se- apart

SUFFIX
-cide kill
-ion state, quality, act
-ous having the quality of

WORDS AND DEFINITIONS
conclusion - the end or last part
exclusion - a shutting out; rejection
seclude - to keep away from; to isolate
herbicide - any chemical used to kill unwanted plants, etc.
herbivorous - a plant-eating