The Collaborative International Dictionary of English v.0.48:

Pluperfect \Plu"per`fect\, a. [L. plus more + perfectus perfect;
   cf. F. plus-que-parfait, L. plusquamperfectum.]
   More than perfect; past perfect; -- said of the tense which
   denotes that an action or event was completed at or before
   the time of another past action or event. -- n. The
   pluperfect tense; also, a verb in the pluperfect tense.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Preterpluperfect \Pre`ter*plu"per`fect\, a. & n. [Pref. preter-
   + pluperfect.] (Gram.)
   Old name of the tense also called pluperfect.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pluperfect
    adj 1: more than perfect; "he spoke with pluperfect precision"
    n 1: a perfective tense used to express action completed in the
         past; "`I had finished' is an example of the past perfect"
         [syn: past perfect, past perfect tense, pluperfect,
         pluperfect tense]