UMLS 专家词典（Specialist Lexicon）是NLM建立 的三个知识源数据库之一，是UMLS项目的 组成部分。专家词典的作用是为自然语言处 理系统提供词汇信息。
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词典专家也鉴定出一个在21世纪仍然常用的单词，虽然它的意思已经改变。
The dictionary experts have also identified a word still commonly used in the 21st century, though its meaning has changed.
柯林斯词典的专家们通过追踪单词出现的频率，已经编辑出一个在日常使用中消失的单词的列表。
Collins Dictionary experts have compiled a list of words which have fallen out of use by tracking how often they appear.
很多词典含有其专家对语法，用法，语言史的指导意见。
Many dictionaries include their experts' guidance on grammar, usage, and the history of the language.
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