A "speck" refers to a tiny spot or particle that is often too small to be easily seen. It can be found in various contexts, such as dust particles in the air or small blemishes on a surface. Specks can be made up of different materials, including dirt, food, or other substances. In science, the term "speck" can also describe minute quantities of matter, like a speck of dust or a speck of light. In everyday language, people might use the term to refer to something insignificant or minor, such as a speck of paint on a wall or a speck of food on clothing.