bêche-de-mer
noun
ˌbesh-də-ˈmer 
ˌbāsh-
1
plural bêche-de-mer or bêches-de-mer ˌbesh-də-ˈmer
ˌbe-shəz-,
ˌbāsh-
: trepang 2
capitalized B&M : any of several English-based pidgins spoken on islands of the western Pacific
Word History
Etymology
French, alteration of biche de mer, from Portuguese bicho do mar, literally, sea worm
First Known Use
1783, in the meaning defined at sense 1