Aes`ti*va"tion (#), n.
1. Zool.
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.]
© Webster 1913.