Protactic
Pro`tac´tic
(prô`tăk´tĭk)| a. | 1. | Giving a previous narrative or explanation, as of the plot or personages of a play; introductory. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
| a. | 1. | Giving a previous narrative or explanation, as of the plot or personages of a play; introductory. |