Etymology
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saguaro (n.)

giant branching columnar species of cactus of the deserts of Arizona and Mexico, 1856, from Mexican Spanish, from a native name of unknown origin, perhaps from Yaqui (Sonoran).

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Definitions of saguaro

saguaro (n.)
extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit;
Synonyms: sahuaro / Carnegiea gigantea
From wordnet.princeton.edu