A line, ray, or plane that divides an angle or geometric figure into two congruent parts; another term for angle bisector.
From Latin 'bisectrix,' the feminine form combining 'bi-' (two) + 'secare' (to cut) + '-trix' (feminine agent suffix). This classical Latin term was standard in European geometry before 'bisector' became dominant.
The word bisectrix reveals how mathematics borrowed Latin's gender system—'bisector' (masculine) and 'bisectrix' (feminine) are the same thing, a quirk showing how deeply Latin shaped mathematical vocabulary across Europe.
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