A spinneret is a silk producing organ possessed by spiders and some insects (often caterpillars of butterflies and moths). Spinnerets are tubular or conical structures and silk is produced in liquid form at the tip. When exposed to the air the silk forms a filament and the spider or insect draws out the silk into a thread. The silk is then used to create a web or covering for a cocoon.

An illustration of the general structure of an arachnid.

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