A manganese deficiency disease of peas (first recorded in Romney Marsh), in which the cotyledons in the seed show brown lesions in the centre.
1930s; earliest use found in Essex Farmers' Journal.
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。