Preparative

Part of speech: noun (n.)

1. That which has the power of preparing, or previously fitting for a purpose; that which prepares. "A preparative unto sermons." Hooker.

2. That which is done in the way of preparation. "Necessary preparatives for our voyage." Dryden.

Part of speech: adjective (a.)

Tending to prepare or make ready; having the power of preparing, qualifying, or fitting; preparatory. Laborious quest of knowledge preparative to this work. South.