interdialectal

adjective

in·​ter·​di·​a·​lec·​tal ˌin-tər-ˌdī-ə-ˈlek-tᵊl 

variants or interdialect

: existing or occurring between dialects

interdialectal borrowing

also, linguistics : characterized by a blending of features from different dialects

In the Kristinestad dialect you can find many such interdialect or compromise forms …

—Ann-Marie Ivars

Word History

First Known Use

1936, in the meaning defined above