estivation

noun
es·​ti·​va·​tion | \ ˌe-stə-ˈvā-shən How to pronounce estivation (audio) \
variants: or aestivation

Definition of estivation

1 zoology : the state or condition of torpidity or dormancy induced by the heat and dryness of summer : the state of one that is estivating Some animals, including various species of snakes, land snails, and lizards, enter a state of dormancy, or estivation, in the summer when water is scarce.— Carrol B. Fleming … they [land snails of the genus Cerion] spend most of this time in the warm weather equivalent of hibernation (called estivation), hanging upside down from vegetation or affixed to rocks.— Stephen Jay Gould
2 usually aestivation, botany : the arrangement or position of the petals or sepals in a flower bud In practice, aestivation is best observed by making hand sections of mature flower buds …— Michael G. Simpson … flowers on the same plants or the same stem may exhibit either clockwise or counterclockwise spiral estivations— Carlos Herrera — compare vernation

First Known Use of estivation

1783, in the meaning defined at sense 1

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The first known use of estivation was in 1783

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Cite this Entry

“Estivation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/estivation. Accessed 17 Jun. 2021.

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More Definitions for estivation

estivation

noun
es·​ti·​va·​tion
variants: or aestivation \ ˌes-​tə-​ˈvā-​shən How to pronounce estivation (audio) \

Medical Definition of estivation

: the state of one that estivates

More from Merriam-Webster on estivation

Britannica.com: Encyclopedia article about estivation

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