The Collaborative International Dictionary of English v.0.48:

Synoptic \Syn*op"tic\, Synoptical \Syn*op"tic*al\, a. [Gr. ?:
   cf. F. synoptique. See Synopsis.]
   Affording a general view of the whole, or of the principal
   parts of a thing; as, a synoptic table; a synoptical
   statement of an argument. "The synoptic Gospels." --Alford.
   -- Syn*op"tic*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

synoptical
    adj 1: presenting or taking the same point of view; used
           especially with regard to the first three gospels of the
           New Testament; "synoptic sayings" [syn: synoptic,
           synoptical]