noun
flour; dusting flour
Specifically flour used to dust a work surface or dough to prevent sticking, especially in noodle-making or baking.
うどんを打つときは、打ち粉をたっぷり使います。
When making udon, we use plenty of dusting flour.
noun
powder; dusting powder
General powder used for polishing, dusting, or applying to surfaces, such as talcum powder or polishing powder.
仕上げに打ち粉をかけて、つやを出します。
At the end, apply powder to bring out the shine.
Compound of 打ち (uchi, 'striking' or 'sprinkling') + 粉 (ko, 'powder'). The term refers to powder that is sprinkled or dusted onto something.