lambdacism

Lambdacism, though, long ago vanished from the Birkenfeld dialect, having given way to the other shift that is customary in Hunsrückisch: rhotacism.

In bygone days, the local Birkenfeld dialect was marked by the peculiarity of often replacing the sounds /d/ and /t/ - and sometimes /r/ as well - with /l/, a shift known as lambdacism.