estival

from WordNet (r) 3.0 (2006)

estival
    adj 1: (rare) of or occurring in summer; "the sky was a
           burnished aestival blue"; "estival winds" [syn:
           {aestival}, {estival}]

from The Collaborative International Dictionary of English v.0.48

AEstival \[AE]s"ti*val\, a. [L. aestivalis, aestivus, fr. aestas
   summer.]
   Of or belonging to the summer; as, [ae]stival diseases.
   [Spelt also {estival}.]
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Estival \Es"ti*val\, a., Estivate \Es"ti*vate\, v. i.,
Estivation \Es`ti*va"tion\, n.
   Same as {[ae]stival}, {[ae]stivate}, etc.
   [1913 Webster]

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