The Collaborative International Dictionary of English v.0.48:

Antiquarian \An`ti*qua"ri*an\, a. [See Antiquary].
   Pertaining to antiquaries, or to antiquity; as, antiquarian
   literature.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Antiquarian \An`ti*qua"ri*an\, n.
   1. An antiquary.
      [1913 Webster]

   2. A drawing paper of large size. See under Paper, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

antiquarian
    adj 1: of or relating to persons who study or deal in antiques
           or antiquities
    2: of or relating to antiques or antiquities
    n 1: an expert or collector of antiquities [syn: antiquary,
         antiquarian, archaist]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "antiquarian":
   Jonathan Oldbuck, Miniver Cheevy, Pre-Raphaelite, antiquary,
   antique collector, antique dealer, antique-car collector,
   archaeological, archaeologist, archaist, classicist, dryasdust,
   eolithic, laudator temporis acti, medievalist, neolithic,
   paleolithic, paleological