preformative
adjEtymology From pre- (prefix meaning ‘before; physically in front of’) + formative, modelled after Late Latin praeformativus (originally used in relation to the grammar of Semitic languages).
Of or pertaining to preformation.
Of a thing: forming or affecting something that comes later.
Grammar, Human sciences, Linguistics, Sciences In Semitic languages of a letter, syllable, etc.: attached to the beginning of a word as a formative element.