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- DictionaryBasal body temperature
noun
- 1. a person's lowest body temperature at rest on a given day, monitored by some women over the course of their menstrual cycle to help predict the time of ovulation.
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noun
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Lowest body temperature each day
Basal body temperature (BBT or BTP) is the lowest body temperature attained during rest (usually during sleep). It is usually estimated by a temperature measurement immediately after awakening and before any physical activity has been undertaken. This will lead to a somewhat higher value than the true BBT. In women, ovulation causes a sustained increase of at least 0.2 °C (0.4 °F) in BBT. Monitori... Wikipedia