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or  es*trum  or chiefly Brit  oes*trus  or  oes*trum  n 1 a  :  a regularly recurrent state of sexual excitability during which the female of most mammals will accept the male and is capable of conceiving  :  HEAT  b  :  a single occurrence of this state  2  :  ESTROUS CYCLE .
Similar sounding terms:  es·ter·ase  es·trous 

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