See gredge.

Raw: only in the term grege silk.

noun. Raw silk: a trade-name.

noun. The raw silk of the domestic silkworm before the gum is removed: a trade or manufacturers' name which has been generally adopted.

transitive verb. To make heavy; to increase.

"Nevertheless, this regularity is one of the principal factors of the value of a thread of "grege," and this to such an extent that badly reeled silks are sold at from twenty to twenty-five francs a kilogramme less than those which are satisfactorily regular."