砥石 / whetstone
砥石 (といし, toishi) means "whetstone" or "sharpening stone" in Japanese. It is used to sharpen knives, tools, and blades by grinding and honing the edge. Japanese whetstones are renowned for their quality, essential for maintaining sharpness in culinary and craft blades.
Curious to hear more about it? Want to learn how to pronounce it? Watch or listen to Episode 84 using the below link 👇