stillhead

plural stillheads

1. The head of a distillation still.

   […] vapor is partially condensed in a stillhead maintained at a constant temperature, the residual vapor escaping from the stillhead has a[…]

   1914, American Chemical Society, Journal of the American Chemical Society, page 2481

   2 more examples

   The upper end of the coil D communicates by a pipe with the stillhead C2, and its lower end opens into a hollow column D3, which is provided with a glass gauge D3, and has at the bottom an outlet pipe[…]

   1895, Charles Edward Groves, William Thorp, William Joseph Dibdin, Chemical Technology: Lighting, by W. Y. Dent [and others, page 208

   Alternatively, a thermometer can be inserted through the condenser attached to the stillhead so the thermometer bulb is in the lower neck of the stillhead.

   2015 January 1, John C. Gilbert, Stephen F. Martin, Experimental Organic Chemistry: A Miniscale & Microscale Approach, Cengage Learning, →ISBN, page 56