herbivore

n. plant-eating animal, herbivorous animal

Herbivory is a form of predation in which an organism known as an herbivore, consumes principally autotrophs such as plants, algae and photosynthesizing bacteria. By that definition, many fungi, some bacteria, many animals, some protists and a small number of parasitic plants can be considered herbivores. However, herbivory is generally restricted to animals eating plants. Fungi, bacteria and protists that feed on living plants are usually termed plant pathogens. Microbes that feed on dead plants are saprotrophs. Flowering plants that obtain nutrition from other living plants are usually termed parasitic plants. More generally, organisms that feed on autotrophs in general are known as primary consumers.
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Noun
1. any animal that feeds chiefly on grass and other plants; "horses are herbivores"; "the sauropod dinosaurs were apparently herbivores"
(hypernym) animal, animate being, beast, brute, creature, fauna

adj. herbivorous, plant-eating

(n.)
One of the Herbivora.