Not in or relating to the period outside of estrus; describing animals not currently in a reproductive cycle.
From Greek 'an-' (without) + 'estrus' (sexual receptivity), used in veterinary and biological contexts. British spelling uses '-ous'; American often uses '-ous' as well.
Female mammals cycle between estrous (fertile, receptive to mating) and anoestrous (resting, not fertile)—understanding this helps vets predict breeding seasons and manage animal populations.
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