What is the origin of vug?
While you may have not heard of the word vug before, you have probably encountered a beautiful specimen of what this uncommon term names. In geology, vug refers to a small cavity in a rock or vein, often lined with crystals. Cavity is the key word, as vug comes from Cornish vooga “cave” (compare Cornish gogow “cave, cavity” and gwag “cave,” Welsh ogof “cave,” Latin fovea “pit”). Vug is also spelled vugg and vugh, and its adjective form is the delightful vuggy. Cornish was a Celtic language of southwest England that went extinct around 1800, but was notably revived in the 20th century. Borrowed from Cornish mining, vug entered English in the early 1800s.