Entry 1 sense Webster, 1913 Semiperspicuous /(sĕm`ĭ*pẽr*spĭk"ū̇*ŭs)/ · Sem·i·per·spic·u·ous · IPA 01 a. Half transparent; imperfectly clear; semipellucid. 1. Half transparent; imperfectly clear; semipellucid.