hy·per·bo·la
noun/haɪˈpɜːbələ/
/haɪˈpɜːrbələ/
(plural hyperbolas, hyperbolae
/haɪˈpɜːbəli/
/haɪˈpɜːrbəli/
)- a symmetrical open curve
enlarge image双曲线 Word Originmid 17th cent.: modern Latin, from Greek huperbolē ‘excess’ (from huper ‘above’ + ballein ‘to throw’).