1. in Greek and Roman mythology, water nymphs who lived in and presided over fountains, wells, springs, streams, and other bodies of fresh water
Usage: mythology
2. the aquatic larval stage of certain insects, especially dragonflies, damselflies, and mayflies
Usage: biology; entomology

Examples

• The ancient Greeks believed naiads protected the purity of freshwater sources.
• According to legend, naiads would punish those who polluted their waters.
• The pond was home to several dragonfly naiads developing underwater.
• Entomologists study naiads to understand insect life cycles.
• The mythology book described naiads as beautiful spirits of rivers and springs.
• Mayfly naiads can live underwater for several years before emerging as adults.