A layered deposit of calcium carbonate on rock where water has flowed or dripped, as on the walls of a cave.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "flowstone" in a sentence
"Another guide also turned off the lights in another room to show visitors the dim phosphorescense from a "flowstone" formation."
"Portions were rocky with slides or jacketed in flowstone."
"Suspended in the flowstone beneath her feet, a dozen dead hadals seemed ready to rise up and break free."