noun
udon flour; wheat flour for udon noodles
Specifically refers to the wheat flour used to make udon noodles. In everyday contexts, it may simply be called うどん粉.
うどん粉と塩と水でうどんを作ります。
I make udon noodles with udon flour, salt, and water.
小麦粉 is general wheat flour, while うどん粉 is specifically the type of wheat flour used for making udon noodles.
Compound of うどん (udon noodles) and 粉 (flour).