bocal

noun2

1. •
   A curved, tapered metal tube which connects the reed of several double reed woodwind instruments (such as the cor anglais, bassoon, and contrabassoon) to the rest of the instrument.
2. •
   A cylindrical glass vessel with a short wide neck.

   • Foie gras comes in bocaux, hermetically sealed glass jars, or in fancy terrines, round porcelain crocks, fancily decorated and more expensive because of the packaging. — 1979