flintware

Century Dictionary and Cyclopedia

1. n. In ceramics: Pottery distinguished by the use of ground flints mixed with the clay.
2. n. Pottery having a slip into which ground flints enter for a considerable part of its volume.

Wiktionary

1. n. A superior kind of earthenware made with flint.

GNU Webster's 1913

1. n. A superior kind of earthenware into whose composition flint enters largely.