The Collaborative International Dictionary of English v.0.48:
cornflour \corn"flour`\, corn flour \corn" flour`\n. a flour or starch prepared from the grains of corn; it is used in cooking as a thickener. Syn: cornstarch. [WordNet 1.5]WordNet (r) 3.0 (2006):
cornflour n 1: starch prepared from the grains of corn; used in cooking as a thickener [syn: cornstarch, cornflour]