from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The external smooth horny layer of a hoof.
from the GNU version of the Collaborative International Dictionary of English
- n. The external smooth horny layer of the hoof of the horse and allied animals.
from The Century Dictionary and Cyclopedia
- n. The thin varnishlike layer on the outer surface of the hoofs of animals, which prevents excessive evaporation of moisture from the horny tissue.
This is doubtless due to the poultice removing the thin, varnish-like, and protective pellicle known as the periople, and thereby allowing the process of evaporation to act on the water normally contained in the hoof.
The coronary band Pulvinus coronae lies in the coronary groove immediately distal to the periople corium, proximal to the parietal surface of the distal phalanx, and abaxial of the ungular cartilages of the foot.
A crack of this description may even show hæmorrhage, and have been in existence for some time, without the periople itself showing any lesion whatever.
The reason is this: Sand-cracks in this position often commence in the wall proper, and not in the periople.
Removal of the periople by excessive rasping of the wall is most certainly a predisposing cause.
In this case the wet, together with the constant friction of the sharp materials of which the road is made, serves to destroy the varnish-like periople.
This appearance is due to a thin layer of horn, secreted independently of the wall proper, termed the periople.
As already stated, it consists of three layers -- the periople, the middle layer, and the leafy layer.
The wall should be covered with the outer varnishlike layer (periople) and should show no cracks or clefts.