Trimester
Medical term · T
A three-month period of time. Pregnancy is divided into three trimesters: First trimester – up to around 13 weeks Second trimester – to around 13 to 26 weeks Third trimester – around 27 to 40 weeks
Related terms
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PeriodA bleed from the vagina between every 3 to 5 weeks which forms part of the menstrual cycle (see menstrual cycle).
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Weak cervixWhen the cervix (the neck of the womb) opens too early in pregnancy, in the second trimester, and without contractions. Used to be known as ‘incompetent cervix’.
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TriiodothyronineOne of two types of major thyroid hormone manufactured by the thyroid gland. It contains three iodine atoms. Also known as T3.