noun
mat woven from wild rice leaves
Rare term for a traditional mat made from the leaves of wild rice (Zizania latifolia).
古い農家では、菰蓆を敷いて作業をしていた。
In old farmhouses, they used to spread mats woven from wild rice leaves for work.
Compound of 菰 (こも, 'wild rice') and 蓆 (むしろ, 'woven mat'). The exact historical derivation is uncertain, but the word directly describes a mat made from wild rice leaves.