What does aestivation mean?
The definition of aestivation
Æs`ti*va”tion, n.
1 (Zoöl.)
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. [Spelt also estivation.]