Entry 1 sense Webster, 1913 Angiosperm /(-ăn"jĭ*ō̇*spẽrm)/ · An·gi·o·sperm · IPA /ˈæn.d͡ʒi.əˌspɝm/ 01 n. A plant which has its seeds inclosed in a pericarp. Contrasted with gymnosperm. 1. A plant which has its seeds inclosed in a pericarp. Contrasted with gymnosperm.(Bot.)