es·ti·val /ˈɛstəvəl/
  (a.)夏天的,夏季的
  es·ti·val /ˈɛstəvəl/ 形容詞
  夏季的,夏的
  Æs·ti·val a.  Of or belonging to the summer; as, æstival diseases. [Spelt also estival.]
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  Es·ti·val a., Es·ti·vate v. i., Es·ti·va·tion n. Same as æstival, æstivate, etc.
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  estival
       adj : (rare) of or occurring in summer; "the sky was a burnished
             aestival blue"; "estival winds" [syn: aestival]