Definition of protoform in English:

protoform

noun

Linguistics
  • A hypothetical form of a word or part of a word from which attested words have been derived; a form reconstructed in a proto-language.

Origin

Early 20th century; earliest use found in Journal African Society. From proto- + form.

Pronunciation

protoform

/ˈprəʊtə(ʊ)fɔːm/