from The Century Dictionary and Cyclopedia
- n. A valve capable of very fine adjustment.
- n. A valve having a stem with a sharp conical point which bears on a conical seat. The stem is made to travel by a very fine screw, and a large turn of the handle is required to make a small change in the opening through the valve.
- n. A similar valve controlling an opening of very small size.
Sorry, no etymologies found.