| oestrus, estrus or estrum (ˈiːstrəs, ˈɛstrəs, ˈiːstrəm, ˈɛstrəm) |
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| —n |
| a regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place; heat |
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| [C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros] |
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| estrus, estrus or estrum |
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| —n |
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| [C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros] |
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| estrum, estrus or estrum |
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| —n |
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| [C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros] |
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| 'oestrous, estrus or estrum |
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| —adj |
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| 'oestral, estrus or estrum |
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| —adj |
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| 'estrous, estrus or estrum |
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| —adj |
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| 'estral, estrus or estrum |
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| —adj |