The Collaborative International Dictionary
Siphonet
Siphonet \Si"phon*et\, n. (Zo["o]l.) One of the two dorsal tubular organs on the hinder part of the abdomen of aphids. They give exit to the honeydew. See Illust. under Aphis.
Wiktionary
siphonet
n. (context zoology English) One of the two dorsal tubular organs on the rear part of the abdomen of aphids, which secrete honeydew.