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dental ledge. 1. a band of ectodermal cells growing from the epithelium of the embryonic jaws into the underlying mesenchyme; local buds from the ledge give rise to the primordia of the enamel organs of the teeth.
In mountaineering a cornice is an overhanging ledge of snow on the edge of a ridge, cliff, or crest of a mountain.Cornices form by wind blowing snow over the leeward edge in successive layers.They can be very dangerous from traveling above and below them. A person or skier putting weight on top of a cornice can cause it to break off and collapse and causing a major fall, with no ground beneath, just snow or ice.ornices form by wind blowing snow over the leeward edge in successive layers. They can be very dangerous from traveling above and below them. A person or skier putting weight on top of a cornice can cause it to break off and collapse and causing a major fall, with no ground beneath, just snow or ice.