The Collaborative International Dictionary of English v.0.48:

Buttery \But"ter*y\, a.
   Having the qualities, consistence, or appearance, of butter.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buttery \But"ter*y\, n.; pl. Butteries. [OE. botery, botry;
   cf. LL. botaria wine vessel; also OE. botelerie, fr. F.
   bouteillerie, fr. boutellie bottle. Not derived from butter.
   See Bottle a hollow vessel, Butt a cask.]
   1. An apartment in a house where butter, milk and other
      provisions are kept.
      [1913 Webster]

            All that need a cool and fresh temper, as cellars,
            pantries, and butteries, to the north. --Sir H.
                                                  Wotton.
      [1913 Webster]

   2. A room in some English colleges where liquors, fruit, and
      refreshments are kept for sale to the students.
      [1913 Webster]

            And the major Oxford kept the buttery bar. --E.
                                                  Hall.
      [1913 Webster]

   3. A cellar in which butts of wine are kept. --Weale.
      [1913 Webster]

   Buttery hatch, a half door between the buttery or kitchen
      and the hall, in old mansions, over which provisions were
      passed. --Wright.
      [1913 Webster]

WordNet (r) 3.0 (2006):

buttery
    adj 1: unpleasantly and excessively suave or ingratiating in
           manner or speech; "buttery praise"; "gave him a fulsome
           introduction"; "an oily sycophantic press agent";
           "oleaginous hypocrisy"; "smarmy self-importance"; "the
           unctuous Uriah Heep"; "soapy compliments" [syn:
           buttery, fulsome, oily, oleaginous, smarmy,
           soapy, unctuous]
    2: resembling or containing or spread with butter; "a rich
       buttery cake"
    n 1: a small storeroom for storing foods or wines [syn:
         pantry, larder, buttery]
    2: a teashop where students in British universities can purchase
       light meals