also: こぐそ
noun
silkworm droppings; silkworm excrement
Refers to the feces of silkworms, often used as fertilizer or in traditional medicine.
蚕糞は昔、肥料として使われていた。
Silkworm droppings were used as fertilizer in the past.
Compound of 蚕 (silkworm) and 糞 (droppings). The reading こくそ is the standard on'yomi combination; こぐそ is a variant with rendaku.