Cyclic Compound (or Ring compound) Posted on 7th November 201523rd July 2021 by ThePD (The Project Definition) A Cyclic Compound (or Ring compound) is any compound in which the constituent atoms or any part of them that forms a ring. 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 Substance and tagged chemistry. 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.