n. 标题字

headword \headword\ n.
1. a word that is qualified by a modifier.
[WordNet 1.5]

2. a word placed at the beginning of a line, paragraph, or
short article (as in a dictionary or encyclopedia entry);
the word which forms the title of an entry in a
dictionary.
[WordNet 1.5]


main entry word \main entry word\ n.
The form of a word that heads a lexical entry and is
alphabetized in a dictionary; also called {entry word},
{headword}, and {lemma}.

Syn: citation form, entry word, headword, lemma.
[WordNet 1.5]

Note: In different languages, different wordforms, such as
cases for verbs, may be taken as the main entry word.
In English dictionaries, it is the infinitive form, but
in latin dictionaries it is usually the first person
singular present.
[PJC]