oestrus
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
General noun
The recurring period of sexual receptivity and fertility in most female mammals.
The vixen comes into oestrus for only a few days each winter.
Medicine noun
The recurring period of sexual receptivity and fertility in a female mammal; being on heat.
I explained the typical signs of oestrus so the owner would know when the bitch was fertile.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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