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In page Tapioca:

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Tapioca is derived from the word tipi'óka, its name in the Tupi language spoken by natives when the Portuguese first arrived in the Northeast Region of Brazil around 1500.[1][2] This Tupi word is translated as 'sediment' or 'coagulant' and refers to the curd-like starch sediment that is obtained in the extraction process.[citation needed]