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Webster's 1913 Dictionary

AESTIVATION

AESTIVATION Æs `ti *va "tion, n.

1. (Zoöl.)

Defn: The state of torpidity induced by the heat and dryness of summer, as in certain snails; -- opposed to hibernation.

2. (Bot. )

Defn: The arrangement of the petals in a flower bud, as to folding, overlapping, etc. ; prefloration. Gray. [Spelt also estivation. ]

New American Oxford Dictionary

aestivation

aes ti va tion ▶noun variant spelling of estivation.

Oxford Dictionary

aestivation

aestivation |ˌiːstɪˈveɪʃ (ə )n, ˌɛst - |(US estivation ) ▶noun [ mass noun ] 1 Zoology prolonged torpor or dormancy of an insect, fish, or amphibian during a hot or dry period. 2 Botany the arrangement of petals and sepals in a flower bud before it opens. Compare with vernation.