aestivation

n. 1. (Zool.) The state of torpidity induced by the heat and dryness of summer, as in certain snails; -- opposed to hibernation. [ 1913 Webster ]

2. (Bot.) The arrangement of the petals in a flower bud, as to folding, overlapping, etc.; prefloration. Gray. [ 1913 Webster ]

[ Spelt also estivation. ] [ 1913 Webster ]