Definition of preforms:
(n) :
An object that has undergone preliminary shaping but is not yet in its final form.
(v) :
To shape something before some other operation.
(n) :
(archaeology) The rough, incomplete and unused basic form of a stone tool.
(n) :
(linguistics) A word that is no longer in use, but has been reconstructed from current ones.
(v) :
Misspelling of perform. [(transitive) To do (something); to execute.]