Etymology
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mescal (n.)

"plant of the genus Agave," found in deserts of Mexico and southwestern U.S., especially the American aloe, or maguey plant, 1702, from Mexican Spanish, from Nahuatl (Aztecan) mexcalli "fermented drink made from agave," from metl "agave" + ixcalli "stew." Meaning "intoxicating liquor from fermented juice (pulque) of the agave" is attested in English from 1828. Also the name of a small desert cactus (peyote) found in northern Mexico and southern Texas (1885).

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mescaline (n.)
crystalline alkaloid, 1896, from German mezcalin (1896), so called because it originally was found in the buttons that grow atop the mescal cacti (see mescal). With chemical suffix -ine (2).
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peyote (n.)

"mescal cactus," 1849, in reference to the mescal made from it, from Mexican Spanish peyote, from Nahuatl (Aztecan) peyotl, said to mean "caterpillar;" the cactus so called from the downy button on top.

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