noun Download 🔗Share A very small brook; a streamlet. Examples : "After the rain, tiny rills trickled down the hillside. " geography nature environment Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A long, narrow depression that resembles a channel, found on the surface of various lunar and planetary bodies. Examples : "The astronauts photographed the winding rills snaking across the dusty surface of the moon. " astronomy geology space geography Chat with AIVocabulary GamePractice Reading