A Latin or Italian plural form of bisectrix; lines or planes that divide geometric figures into two equal parts.
From Latin 'bisectrix' (feminine form of bisector), with the classical Latin/Italian feminine plural ending -ices. This is the traditional mathematical term in Romance languages and older European geometry texts.
This word is a linguistic fossil—it's the 'fancy' Latin plural you'd find in 300-year-old geometry textbooks, which is why modern mathematicians just say 'bisectors,' but bisectrices lives on in formal academic Italian and museum-quality mathematics.
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