1. a small cave, especially one that is artificial or decorated
2. a structure or shrine built to resemble a cave

Examples

• The garden featured a beautiful grotto with a small waterfall.
• Pilgrims visited the grotto where the saint was said to have prayed.
• The artificial grotto was decorated with shells and colorful stones.
• We discovered a natural grotto hidden behind the rocks.
• The park’s grotto provided a cool, shaded place to rest.
• The religious grotto contained a statue of the Virgin Mary.