Chinese Dictionary Question What do the characters in angle brackets signify?

Examples:



http://www.zdic.net/z/15/xs/4E48.htm
"〈后缀〉"   "〈助〉"

http://www.zdic.net/z/16/xs/54C1.htm
"〈形〉"   "〈名〉"   "〈动〉"
Every good dictionary has the definitions of the words and its classes. The class of the word comes before the definition of thereof. That way you might know what is its definition as used in a specific class before you even read its definition. By classes I mean: nouns, verbs, pronouns, suffixs, etc. For exemple, the word 么 as a suffix has a different meaning when compared when used as a "auxiliary"