| animal phylum comprised of sponges |
| cold-blooded vertebrate comprised of frogs and toads, newts and salamanders and caecilians |
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. |