estival
— Adjective
– English
~ (rare) of or occurring in summer; "the sky was a burnished aestival blue"; "estival winds"
estivate
— Verb
– English
~ sleep during summer; "certain animals estivate"
estivation
— Noun
– English
~ (botany) the arrangement of sepals and petals in a flower bud before it opens
estivation
— Noun
– English
~ (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period