The Collaborative International Dictionary of English v.0.48:

crenelated \crenelated\ adj.
   1. having repeated square indentations like those in a
      battlement; as, a crenelated molding.

   Syn: embattled, crenelate, crenellated, crenellate, indented.
        [WordNet 1.5]

   2. having turrets and battlements in the style of a castle;
      -- of a building.

   Syn: battlemented, castellated, castled, crenellated.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Crenelate \Cren"el*ate\ (kr?n"?l-?t or kr?"n?l-?t), v. t. [imp.
   & p. p. Crenelated (-?`t?d); p. pr. & vb. n. Crenelating
   (-?`t?ng).] [LL. crenellare, kernellare: cf. F. cr?neler to
   indent. See Crenelle.] [Written also crenellate.]
   1. To furnish with crenelles.
      [1913 Webster]

   2. To indent; to notch; as, a crenelated leaf.
      [1913 Webster]

   Crenelated molding (Arch.), a kind of indented molding used
      in Norman buildings.
      [1913 Webster]