Formative

Part of speech: noun (n.)

1. That which serves merely to give form, and is no part of the radical, as the prefix or the termination of a word.

2. A word formed in accordance with some rule or usage, as from a root.

Part of speech: adjective (a.)

1. Giving form; having the power of giving form; plastic; as, the formative arts. The meanest plant can not be raised without seed, by any formative residing in the soil. Bentley.

2. Serving to form; derivative; not radical; as, a termination merely formative.

3. Capable of growth and development; germinal; as, living or formative matter.