Alfalfa

google

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mid 19th century: from Spanish, from Arabic al-faṣfaṣa, a green fodder.

wiktionary

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From Spanish alfalfa, from early form alfalfez, from Arabic الْفِصْفِصَة‎ (al-fiṣfiṣa), الْفَصْفَصَة‎ (al-faṣfaṣa, “alfalfa, lucerne”, literally “horse-food”).

etymonline

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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."