silex

noun2

1. •
   A finely ground relatively pure form of silicas used as a paint filler etc.
2. •
   (no longer used) Flint.

noun1

1. •
   (old-fashioned) A vacuum coffee maker.

   • The Navy uses several types of coffee makers – urns, silexes, and percolators. Each type requires special care in making good coffee. — 1965