pre·form 
(prēfôrm)
(prēfôrm)tr.v. pre·formed, pre·form·ing, pre·forms
1. To shape or form beforehand.
2. To determine the shape or form of beforehand.
n.
1. An object that has been subjected to preliminary, usually incomplete shaping or molding before undergoing complete or final processing.
2. Linguistics A reconstructed ancestral word or form.