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sesame (n.)

early 15c., sisamie, probably from Latin sesamum (nominative sesama), from Greek sesamon (Doric sasamon) "seed or fruit of the sesame plant," a very early borrowing via Phoenician from Late Babylonian *shawash-shammu (compare Assyrian shamash-shammu "sesame," literally "oil-seed"). Medieval Latin had it as sisaminum; Old French as sisamin.

First as a magic password in a 1785 translation of Galland's "Mille et une nuits," where it opens the door of the thieves' den in "Ali Baba and the Forty Thieves." The exact phrase open sesame is attested from 1793 in another translation, current since about 1826.

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Definitions of sesame from WordNet

sesame (n.)
East Indian annual erect herb; source of sesame seed or benniseed and sesame oil;
Synonyms: benne / benni / benny / Sesamum indicum
From wordnet.princeton.edu