crenel

from WordNet (r) 3.0 (2006)

crenel
    n 1: one of a series of rounded projections (or the notches
         between them) formed by curves along an edge (as the edge
         of a leaf or piece of cloth or the margin of a shell or a
         shriveled red blood cell observed in a hypertonic solution
         etc.) [syn: {scallop}, {crenation}, {crenature}, {crenel},
         {crenelle}]
    2: a notch or open space between two merlons in a crenelated
       battlement [syn: {crenel}, {crenelle}]
    v 1: supply with battlements [syn: {crenel}, {crenelate},
         {crenellate}]

from The Collaborative International Dictionary of English v.0.48

Crenel \Cre*nel"\ (kr?-n?l"), n.
   See {Crenelle}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Crenelle \Cre*nelle"\, Crenel \Cre*nel"\ (kr?-n?l"), n. [OF.
   crenel, F. cr?neau, LL. crenellus, kernellus, dim. (prob.)
   fr. L. crena notch. See {Crenny}.]
   1. An embrasure or indentation in a battlement; a loophole in
      a fortress; an indentation; a notch. See {Merlon}, and
      Illust. of {Battlement}.
      [1913 Webster]

   2. (Bot.) Same as {Crenature}.
      [1913 Webster]