ignis fatuus /igˈnis fatˈū-əs or fatˈŭ-ŭs/

1. Will-o'-the-wisp, the light produced by combustion of marsh-gas, which may lead a traveller into danger
2. Any delusive ideal or hope that may lead one astray

• quacks
• quacksalver
• quacksalvers
• quacksalving
• quad
• Quad
• quad bike
• quadded
• quadding
• quadr-
• quadragenarian
• quadragenarians
• quadragenary
• Quadragesima
• quadragesimal
• quadrangle
• quadrangles
• quadrangular
• quadrangularly
• quadrans
• quadrant
• quadrantal
• quadrantes
• quadrants
• quadraphonic