Entry 1 sense Webster, 1913 Lemniscus /(lĕm*nĭs"kŭs)/ · Lem·nis·cus · IPA /lɛmˈnɪ.skəs/ 01 n. One of two oval bodies hanging from the interior walls of the body in the Acanthocephala. 1. One of two oval bodies hanging from the interior walls of the body in the Acanthocephala.(Zool.)