Definitions of alfalfa is:
uncountable noun alfalfa
Alfalfa is a plant that is used for feeding farm animals. The shoots that develop from its seeds are sometimes eaten as a vegetable.
a leguminous plant, Medicago sativa, of Europe and Asia, having compound leaves with three leaflets and clusters of small purplish flowers. It is widely cultivated for forage and as a nitrogen fixer and used as a commercial source of chlorophyll
a deep-rooted perennial plant (Medicago sativa) of the pea family, with small divided leaves, purple cloverlike flowers, and spiral pods, used extensively for fodder and pasture and as a cover crop
Other words based on alfalfa: