from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Estrous.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Alternative spelling of oestral.
Sorry, no etymologies found.
"File accesses are easy to track, anyone can do it, and you spent a lot of time looking into blood typing and paternity and estral cycles just after Cadzie was born."
Some bitches will exhibit a variety of estral signs, making them extremely attractive to males.