The Collaborative International Dictionary of English v.0.48:

Scriptural \Scrip"tur*al\ (?; 135), a.
   Contained in the Scriptures; according to the Scriptures, or
   sacred oracles; biblical; as, a scriptural doctrine.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scriptural
    adj 1: of or pertaining to or contained in or in accordance with
           the Bible; "biblical names"; "biblical Hebrew" [syn:
           biblical, scriptural]
    2: written or relating to writing

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "scriptural":
   Biblical, Christian, Gospel, Mosaic, New-Testament, Old-Testament,
   accepted, apocalyptic, apostolic, approved, authentic,
   authoritative, autograph, autographic, calligraphic, canonical,
   chirographic, conventional, correct, cursive, customary, engrossed,
   evangelic, evangelical, evangelistic, faithful, firm, flowing,
   gospel, graphic, graphoanalytic, graphologic, graphometric,
   holograph, holographic, in longhand, in shorthand, in writing,
   inscribed, inspired, italic, italicized, literal, longhand,
   manuscript, of the faith, on paper, orthodox, orthodoxical,
   penciled, penned, printed, proper, prophetic, received, revealed,
   revelational, right, running, scriptorial, shorthand, sound,
   standard, stylographic, textual, textuary, theopneustic,
   traditional, traditionalistic, true, true-blue, written