Entry 1 sense Webster, 1913 Endodermal /ĕnˌ-dōd-ẽrm'-əl/ · En·do·der·mal · IPA /ˌɛndoʊdˈɜrməl/ 01 a. Of or pertaining to the endoderm. 1. Of or pertaining to the endoderm.(Biol.)