Each of the five divisions of an animal having fivefold symmetry.
Early 20th century; earliest use found in Ray Lankester (1847–1929), zoologist. From penta- + -mere.
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。