the world > animals > invertebrates > phylum Arthropoda > class Insecta > Heterocera > [noun] > family Bombycidae > genus Bombyx > silk moth > caterpillar of bombyx mori or silkworm > innermost wrapping of chrysalis in (2)
The innermost wrapping of the chrysalis in a silk cocoon. Cf. knub, n. 3. Obsolete.
The innermost wrapping of a silkworm cocoon. Frequently in plural (often used to refer to waste silk in this form). Cf. nub, n.1 1. Now rare.