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| major grouping of small-to-microscopic pseudocoelomate organisms |
| vertebrate with body hair that nourishes young with milk from mammary glands |
| estivation (ˌiːstɪˈveɪʃən, ˌɛs-) | |
| —n | |
| the usual US spelling of aestivation | |
| estivation (ěs'tə-vā'shən) Pronunciation Key
An inactive state resembling deep sleep, in which some animals living in hot climates, such as certain snails, pass the summer. Estivation protects these animals against heat and dryness. Compare hibernation. |