n. A water-soluble glycoprotein that binds the two fibroin filaments of a silk fibre
the GNU version of the Collaborative International Dictionary of English
n. A gelatinous nitrogenous material extracted from crude silk and other similar fiber by boiling water; -- called also silk gelatin.
The Century Dictionary and Cyclopedia
n. The gelatinous substance of silk; silk-gelatin.
Word Usage
"The silk is a continuous-filament fiber consisting of fibroin protein, secreted from two salivary glands in the head of each larva, and a gum called sericin, which cements the two filaments together."