Is the word "adjectival" used in this context?

My English Fundamentals professor keeps using the word "adjectival" as in "adjectival clause" but I can't find it being used anywhere else but his class notes. I know that the word exists but is it used in this context or in similar situations? I can't find it being used in the context of "adjectival clause". It's just adjective clause.

Solution 1:

adjectival clause or relative clause or adjective clause

An adjectival clause (or relative clause) is one that modifies a noun phrase. They typically are introduced by a relative pronoun, which serves as the subject of the clause. For example: The man who lived here went to New York. The car that came from Italy is very fast. The apple which fell from my bag is now inedible.

adjectival clause

there are adverbial clauses, and for parallelism's sake, there are adjectival clauses AKA relative clauses.

Relative clause In Indo-European languages, a relative clause, also called an adjectival clause or an adjective clause, meets three requirements:

adjectival

Sometimes, things are known by several different names.