1Medicine a band of bluish or dark grey discolouration in this location, occurring as a sign of chronic heavy metal poisoning.
2The line at which the gum is attached to a tooth; the margin of the gum; the gum line.
Mid 19th century.
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。