es·ti·va·tion also aes·ti·va·tion (ĕs′tə-vāshən)
1. Zoology A state of dormancy or torpor during a hot dry period.
2. Botany The arrangement of the floral parts in a bud.
3. The act of spending or passing the summer.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.