Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To indent; to notch; as, a crenelated leaf.

   {Crenelated molding} (Arch.), a kind of indented molding used
      in Norman buildings.

Source : WordNet®

crenelate
     adj : having repeated square indentations like those in a
           battlement; "a crenelated molding" [syn: {embattled}, {crenelated},
            {crenellated}, {crenellate}, {indented}]

crenelate
     v : supply with battlements [syn: {crenel}, {crenellate}]