The Collaborative International Dictionary
Preterimperfect
Preterimperfect \Pre`ter*im*per"fect\, a. & n. [Pref. preter- + imperfect.] (Gram.) Old name of the tense also called imperfect.
Wiktionary
preterimperfect
a. (context grammar archaic English) imperfect n. (context grammar archaic English) The imperfect tense.