Guksu refers to noodles made from dough consisting of flour from various grains such as wheat, buckwheat, rice, and potatoes, which are then stretched and cut into long, thin strips. The term "guksu" is a pure Korean word, while "myeon" is the Sino-Korean term for noodles.

In Korean, "guksu" can have a broad meaning encompassing all types of noodles or a narrow meaning referring specifically to a type of Korean noodle dish called "janchi guksu" (banquet noodles).