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单词 perihelial
释义

WordReference Random House Learner's Dictionary of American English © 2024
per•i•he•li•on /ˌpɛrəˈhiliən, -ˈhilyən/USA pronunciation   n. [countable], pl. -he•li•a 
    /-ˈhiliə, -ˈhilyə/.USA pronunciation  
  1. Astronomythe point in the orbit of a planet or comet at which it is nearest to the sun.Compare aphelion.
See -helio-.
WordReference Random House Unabridged Dictionary of American English © 2024
per•i•he•li•on  (per′ə hē′lē ən, -hēl′yən),USA pronunciation n., pl. -he•li•a (-hē′lē ə, -hēl′yə).USA pronunciation [Astron.]
  1. Astronomythe point in the orbit of a planet or comet at which it is nearest to the sun. Cf. aphelion. See diag. under aphelion. 
  • Greek peri- peri- + hé̄li(os) sun + -on neuter noun, nominal suffix, on the model of perigee; earlier in the Neo-Latin form perihelium
  • 1660–70
per′i•he′li•al, per′i•he′li•an, adj. 
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更新时间：2025/2/23 12:49:50