tundish

plural tundishes

1. A kind of funnel used in brewing fitting into the bung-hole of a tun or cask.

   For filling a bottle with a Tunne-dish.

   1623, William Shakespeare, Measure for Measure, page iii. i. 431

   1 more example

   That? said Stephen. Is that called a funnel? Is it not a tundish?

   1916, James Joyce, A Portrait of the Artist as a Young Man, page 368

2. A funnel used in smelting, foundry work etc.
3. A funnel used to create a siphonic break in a drainage system and/or provide visual indication of flow, usually in an overflow line.