From ZooTerms (Dictionary of Invertebrate Zoology)
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silk (noun; Greek serikos, silk): 1. A secretion that hardens so rapidly on extrusion that it may be produced as a long continuous thread.

2. (Arthropoda: Chelicerata) Secreted by specialized salivary glands in Acari; anterior of the abdomen in Araneae; the galea of Pseudoscorpionida.

3. (Arthropoda: Insecta) Secreted from dermal openings on the abdomen in some Coleoptera; foretarsi in Embioptera and some empidid Diptera; malpighian tubes discharging at the anus in Neuroptera, some Coleoptera and Hymenoptera; mouth cavity (usually modified salivary glands) in Psocoptera, Siphonaptera, some Diptera, Trichoptera, Lepidoptera and Hymenoptera.