ASCIDIAN Meaning of ASCIDIAN in English [ ə'sɪdɪən ]■ noun Zoology a sea squirt.OriginC19: from mod. L. plural Ascidia (genus name), from Gk askidion , dimin. of askos 'wineskin'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004