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.)
2.a notch or open space between two merlons in a crenelated battlement
Idiom of the Day
put out (some) feelers or put (some) feelers out
to attempt to find out something without being too obvious about it
I put out some feelers to see if it would be easy to find another job.