The word "颗粒无收" is formed by directly combining the two-character term "颗粒", which means grains or kernels, with the two-character term "无收", meaning no harvest. The characters are sequenced to literally express "not a single grain is harvested", where "颗粒" specifies the smallest units of crop and "无收" denies their collection, resulting in a concise description of complete agricultural loss.