The Greek word hyakínthinos, represented by G5191, is a specific adjective meaning "hyacinthine" or "jacinthine," which denotes a deep blue color. This term is exceptionally rare in scripture, appearing only 1 time in 1 unique verse. Its sole use is to describe a specific visual element within a prophetic vision, linking its meaning directly to the color of the jacinth stone.
The single biblical occurrence of G5191 is found in the apocalyptic vision of Revelation 9:17. In this passage, John describes a terrifying supernatural cavalry, stating that the riders had "breastplates of fire, and of jacinth, and brimstone." The word provides a specific color, deep blue, to the armor of these formidable figures. This use of G5191 contributes to a vivid and unnerving image where the colors of the riders' breastplates mirror the destructive elements of fire, smoke, and brimstone that issue from the mouths of their horses.
Several related words in the immediate context of Revelation 9:17 help clarify the role and meaning of hyakínthinos:
- G2382 thṓrax (breast-plate): This is the object that G5191 describes. The riders are equipped with a breast-plate, a piece of armor for the chest, signifying their martial and destructive purpose Revelation 9:17.
- G4447 pýrinos (of fire): This adjective is used in parallel with G5191 to describe the breastplates, linking the deep blue of jacinth with the color of fire Revelation 9:17.
- G2306 theiṓdēs (brimstone): The third descriptor for the breastplates, this "sulphur-like" color connects the riders' appearance directly to themes of judgment Revelation 9:17.
- G4442 pŷr (fire): This element, which comes from the mouths of the horses, is also used to describe the breastplates, creating a direct visual link between the riders' armor and their destructive power Revelation 9:17.
While appearing only once, the theological context of G5191 is significant due to its associations.
- Imagery of Judgment: The word jacinth is part of a trio of descriptors—fire, jacinth, and brimstone—that are strongly associated with divine judgment and destruction throughout the book of Revelation.
- Apocalyptic Vision: As a descriptor, G5191 contributes to the unique and terrifying nature of the vision in Revelation 9:17, painting a picture of a supernatural army that is unlike any earthly force.
- Symbolic Armor: The term is used to describe a breast-plate G2382, connecting the deep blue color to the defensive and offensive nature of the riders in this prophetic judgment.
In summary, G5191 is a highly specific term for the color "deep blue," or jacinth. Its importance is derived entirely from its single, powerful use in Revelation 9:17. Paired with descriptions of fire and brimstone, it does more than add color; it contributes to the fearsome and judgmental imagery of the apocalyptic vision, tying this rare word to a scene of divine wrath.