'Cornstarch' definitions:

Definition of 'cornstarch'

noun

Starch prepared from the grains of corn; used in cooking as a thickener [syn: cornstarch, cornflour]

From: GCIDE

Cornstarch \Corn"starch`\ (-st[aum]rch`), n. Starch made from Indian corn, esp. a fine white flour used for puddings, etc. [1913 Webster]