A tern (genus Sterna). Also (rare): the black-headed gull, Larus ridibundus.
Late 18th century; earliest use found in The Gentleman's Magazine. From pictarne + -y.
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。