the part of the foot of a horse, cow, etc., between the fetlock and the hoof.
2.
either of the two bones of this part, the upper or first phalanx (great pastern bone) and the lower or second phalanx (small pastern bone), between which is a joint (pastern joint).
Origin: 1300–50; Middle English pastron shackle, probably same word as Middle French pasturon, pastern < Vulgar Latin *pastōria herding (see pastor, -ia) + Middle French -on noun suffix
1284, "shackle fixed on the foot of a horse or other beast," from O.Fr. pasturon, dim. of pasture "shackle for a horse in pasture," from V.L. *pastoria, noun use of fem. of L. pastorius "of herdsmen," from pastor "shepherd" (see pastor). Metathesis of -r- and following vowel