Definition of "neck-ring" [neck-ring]

• In entomology, the prothorax when it is slender and somewhat elongate, as in the Aphides or plant-lice. (noun)
• In mech., a bushing fitted in the bottom of the stuffing-box on an engine-cylinder or steam-chest. (noun)

The Century Dictionary (Public Domain)

• "This species is named for the faint hint of red on its belly that has got to be one of the most obscure field marks ever used to name a bird I also have same complaint about the ring-necked duck, whose neck-ring is only visible to those with x-ray vision."
• "As for the girl, he had promptly, to her horror, had her clothing removed and had had her put in a brief rep-cloth slave tunic and a rude neck-ring of curved iron, that she would not escape and, anywhere, could be recognized as a slave."
• "Lying on his back and staring up at the hovering darkness, Sigurd heard the click as his manacles and neck-ring were unlocked."