cornet-à-pistons

[kawr-net-uh-pis-tuh nz; French kawr-ne-a-pee-stawn]
noun, plural cor·nets-à-pis·tons [kawr-nets-uh-pis-tuh nz; French kawr-ne-za-pee-stawn] /kɔrˈnɛts əˈpɪs tənz; French kɔr nɛ za piˈstɔ̃/.
  1. cornet(def 1).

Origin of cornet-à-pistons

1830–40; < French: literally, cornet with valves
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018