linguistic form
/lɪŋˌɡwɪstɪk ˈfɔːm/Linguistics
noun
1A unit or pattern of language, typically considered independently from its associated function or value.
2The characteristics or form of such units or patterns of language. Also: these characteristics considered in relation to one such unit or pattern of language.
Origin
Mid 19th century; earliest use found in Christian Review. From linguistic + form.