preformative

noun

1. a formative letter, syllable, etc., at the beginning of a word.

   “Ch. a prefix prep. as in Hebrew, the sign of the dative; also of the genitive and accusative; and as a conj. before the future, which then rejects the preformative, that”

2. (alt-of, misspelling)Misspelling of performative.

adj

1. (not-comparable)Of or pertaining to preformation.
2. (not-comparable)Of a thing: forming or affecting something that comes later.
3. (not-comparable)of a letter, syllable, etc.: attached to the beginning of a word as a formative element.