Webster's English Dictionary

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sesame

ses.a.me \'ses-*-me-\ n [alter. of earlier sesam, sesama, fr. L sesamum, 
   sesama], fr. Gk se-samon, se-same-, of Sem origin; akin to Assyr 
   shachek>amashachek>shachek>amu sesame, Ar simsim 1: an East Indian annual 
   erect herb (Sesamum indicum of the family Pe daliaceae); also : its small 
   flattish seeds used as a source of oil and a flavoring agent 2: OPEN SESAME