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.
Formed from 熨す, “to stretch or flatten,” and 糸, “thread,” referring to coarse silk fibers drawn from the outside of a cocoon.