Of the foot of an ungulate or (in later use) the hand of a primate: having the axis of symmetry running through the central digit.
Late 19th century. From meso- + axon + -ic; compare earlier homaxonic and monaxonic.
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。