Any of the types of cultivated onion (chiefly varieties of the bulb onion, Allium cepa), grown as a field crop.
Late 16th century (in an earlier sense). From field + onion.
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。