Etymology
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alfalfa (n.)

1845, from Spanish alfalfa, earlier alfalfez, said by Iberian sources to be from Arabic al-fisfisa "fresh fodder." Watkins says ultimately from Old Iranian compound *aspa-sti- "alfalfa, clover," from *aspa- "horse" (from PIE root *ekwo- "horse") + -sti- "food," from suffixed form of PIE root *ed- "to eat."

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Definitions of alfalfa

alfalfa (n.)
important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop;
Synonyms: lucerne / Medicago sativa
alfalfa (n.)
leguminous plant grown for hay or forage;
From wordnet.princeton.edu