Etymology
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tapioca (n.)

1640s, tipiaca, from Portuguese or Spanish tapioca, from Tupi (Brazil) tipioca "juice of a pressed cassava," from tipi "residue, dregs" + og, ok "to squeeze out" (from roots of the cassava plant).

updated on January 14, 2014

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Definitions of tapioca from WordNet

tapioca (n.)
granular preparation of cassava starch used to thicken especially puddings;
From wordnet.princeton.edu, not affiliated with etymonline.