Venom sac

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Venom sac
You may be looking for Venom gland.

Bees usually lost their venom sacs when they lost their stings. (PROSE: Eater of Wasps [+]Loading...["Eater of Wasps (novel)"])

Kagawan lizards had venom sacs from which the Kagawa Virus was synthesised. (PROSE: Virus [+]Loading...["Virus (short story)"])

Zygons carried venom sacs in their tongues. (TV: The Day of the Doctor [+]Loading...["The Day of the Doctor (TV story)"])