IPA: //ˈfɒs.dʒiːn//
KK: /ˈfɔsˌdʒin/
A colorless gas or liquid that can be very harmful and is used in making certain chemicals and materials.
Phosgene was used as a chemical weapon during World War I.
Phosgene is derived from the Greek roots "phōs" (φως) (meaning light) and "genes" (γένος) (meaning born of or produced by). The term refers to a compound that is produced from light in the context of chemical reactions, particularly in the synthesis of certain organic compounds.
Think of 'light' ('phōs') being involved in the creation ('genes') of this chemical compound, which helps you remember that phosgene is related to light in its formation.