Shimmering Optical Illusion in the Desert
Puzzle 15 of The 1950s Hard Pack
Question is: Shimmering Optical Illusion in the Desert
and the answer is: MIRAGE
Word Meaning:
MIRAGE — An optical phenomenon in which light is refracted through a layer of hot air close to the ground, often giving the illusion of a body of water.
Definitions from Wiktionary.