Early 20th century; earliest use found in The Botanical Gazette. From pan- + tropic, after German pantropisch.
1930s; earliest use found in Journal of Pathology and Bacteriology. From pan- + -tropic.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。