How do you spell trancespertasion?

The word you are looking for is likely "transpiration", which refers to the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems, and flowers.

It's possible there's a typo in your request, or you might be thinking of a different word altogether. If you can provide more context or clarify what you're looking for, I might be able to help you further.