In craniometry: the midpoint of a line drawn to connect the frontal tuberosities.
Late 19th century; earliest use found in John S. Billings (1838–1913). From French métopion from métop- (in métopique) + -ion.
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。