monestrous

adj

1. (not-comparable)Of or pertaining to a mammal, such as the dog, that only enters into heat once during each of its normal breeding cycles.

   “The dog, wolf, and fox are monestrous, the fox and wolf having one and the dog two cycles in a year.”

   “Males of monestrous species also exhibit a cycle, being sexually active only during the females' estrus.”

   “Most wild carnivorous mammals are monestrous.”