from The Century Dictionary and Cyclopedia
- n. Marly limestone capable of yielding hydraulic cement. Compare water-lime.
- n. pl. [capitalized] In English geol., a division of the Keuper.
Sorry, no etymologies found.
For the demonstration in the video we're using a waterstone that I have soaked for about 20 minutes before sharpening in order to soften it a little.
"The best I can figure, the waterstone works with sound that can make solids of liquids and liquids of solids.