1.
cocoon filament; silk thread
The single continuous filament a silkworm spins to make its cocoon, the raw material of silk thread. A term from sericulture and the silk industry.
Composed of 繭 (cocoon) and 糸 (thread). Japan has a long history of sericulture (養蚕), and silk production was a major industry from the Edo period through the early twentieth century. The 富岡製糸場 (Tomioka Silk Mill), a UNESCO World Heritage Site, is a famous example of Japan's silk industry.