ergocalciferol

noun
er·​go·​cal·​cif·​er·​ol | \ ˌər-(ˌ)gō-kal-ˈsif-ə-ˌrȯl How to pronounce ergocalciferol (audio) , -ˌrōl How to pronounce ergocalciferol (audio) \

Medical Definition of ergocalciferol