Terrestrial Posted on 23rd December 20156th May 2021 by ThePD (The Project Definition) Terrestrial means relating to the earth or pertaining to sediments or depositional environments on land or above the level of high tide. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Science and tagged geology. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.