preformative · noun, adjective1
From pre- (prefix meaning ‘before; physically in front of’) + formative, modelled after Late Latin praeformativus (originally used in relation to the grammar of Semitic languages).
preformative · noun2
In many cases merely a typo; less commonly, sometimes due to a misapprehension of morphology.
Etymology from Wiktionary, CC BY-SA 4.0.