cornicle

[kawr-ni-kuhl]
noun
any of various small, horn-shaped processes, especially one of a pair of tubes at the posterior end of the abdomen of aphids, from which a waxy fluid is emitted.

Origin:
1640–50; < Latin corniculum little horn, equivalent to corn- (stem of cornū) horn + -i- -i- + -culum -cle1

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Foxglove aphids are also unique in that they have a bright green or dark colored spot at the base of each cornicle.
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