蚕糸

1. Origins, structure, and basic meaning

• Structure: 蚕糸 (さんし) can denote silk thread from silkworms or the field of silk production.
• Basic usage: 蚕糸業 names the regional silk industry, while 細い蚕糸 identifies the thread wound around a sample.

2. Common pitfalls and similar expressions

• Industry compound and material noun
  • Adding 業 shifts the reference to production as an industry; without it, the context can point to the physical thread.