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The Collaborative International Dictionary
estivation

AEstivation \[AE]s`ti*va"tion\, n.

  1. (Zo["o]l.) The state of torpidity induced by the heat and dryness of summer, as in certain snails; -- opposed to hibernation.

  2. (Bot.) The arrangement of the petals in a flower bud, as to folding, overlapping, etc.; prefloration.
    --Gray.

Wiktionary
estivation

n. (alternative spelling of aestivation English)

WordNet
estivation
  1. n. (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period [syn: aestivation]

  2. (botany) the arrangement of sepals and petals in a flower bud before it opens [syn: aestivation]

Usage examples of "estivation".

When the home planet once again swung away from its ferocious sun, gracile Haluk awakened from estivation and emerged from their protective shells to carry on their interrupted lives.