herbi- comes from a Latin word meaning plant, herbis
-vor- comes from a Latin word meaning to eat, vorare
-ous as a suffix creates an adjective & means full of
prefix + root + suffix = plant + to eat + full of
= plant-eating ✓
Part of speech:
Many ancient humans were largely herbivorous. Indeed, plants are more plentiful, easier to collect, and more reliable sources of energy.