1. Narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay. 2. Bulky food like grass or hay for browsing or grazing horses or cattle. 3. vegetation consisting of typically short plants with long, narrow leaves, growing wild or cultivated on lawns and pasture, and as a fodder crop. Poaceae or Gramineae is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns and pasture. The latter are commonly referred to collectively as grass. Scientific name: Poaceae Order: Poales Kingdom: Plantae Eaten by: Guinea pig, Llama