from the GNU version of the Collaborative International Dictionary of English
- n. a rein attached to the bit.
from The Century Dictionary and Cyclopedia
- n. A rein uniting a bit with some other part of the harness, or leading to the hand of the rider or driver.
Sorry, no etymologies found.
Three of Evans 'men were dismounted, and two of their horses stood heads and tails, each bridle rein thrown over the other's saddle-horn.