Answer: cassava

AnswerCrossword Clue
CASSAVA

Starch in tapioca

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Tapioca source

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Starchy tropical root

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Source of tapioca
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Its rootstock is made into tapioca.
CASSAVAStarch used in making tapioca.
CASSAVASource of tapioca.
CASSAVATapioca-yielding tree
CASSAVATapioca plant