noun
coarse silk from outside of cocoon; waste silk thread
Technical term in sericulture; refers to the rough outer layer of silk filament that is not suitable for fine reeling and is used as a lower-grade thread.
熨斗糸は繭の外側から取れる粗い絹糸で、高級な生糸にはならない。
Noshi-ito is a coarse silk thread obtained from the outside of the cocoon and does not become high-quality raw silk.
真綿 is floss silk made from damaged cocoons or waste silk, often used for padding; 熨斗糸 is specifically the thread spun from the outer cocoon layer.
熨斗 (のし) originally referred to a thin strip of dried abalone used as a ceremonial gift decoration, but here it likely refers to something stretched or flattened, describing the coarse, flat nature of the outer silk layer. 糸 (いと) means thread. The exact derivation is uncertain.