a starch or a starchy flour made from corn and used for thickening gravies and sauces, making puddings, etc.
Also called, especially British, corn flour.

1850–55, Americanism; corn1 + starch Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cornstarch (ˈkɔːnˌstɑːtʃ)
(US), (Canadian) Also called (in Britain and certain other countries): cornflour a fine starchy maize flour, used esp for thickening sauces

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Corn is also used to produce sweeteners such as corn syrup and cornstarch.
In a bowl combine the cornstarch, flour, and baking powder.
Add the cornstarch mixture too, and cook until it thickens, about a minute or
Replacing plastics will be an entire family of biopolymers made from cornstarch.
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