Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR PARENT LANGUAGE

Evidently they have all sprung from a parent language no longer adequately represented by any one of them.

MORE RELATED WORDS FOR PARENT LANGUAGE

mother tongue

nounnative language
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.