Characterized by or involving backward motion, especially of the lower jaw in chewing. Contrasted with proal.
Late 19th century; earliest use found in Edward Cope (1840–1897). Irregularly from ancient Greek πάλιν backward + -al.
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。