In Haeckel's theory of siphonophore structure: a modified medusoid.
Late 19th century; earliest use found in Ernst Haeckel (1834–1919). From German Medusom from Medu- (in Medusoid) + -som.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。