A South American buffalo gnat, Simulium pertinax.
Mid 19th century; earliest use found in Journal of the Royal Geographical Society of London. From Portuguese pium, piúm from Tupi pi'ũ.
英语词典包含464360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。