headword

n. heading, opening word or phrase (of a chapter, encyclopedia entry, etc.)

A headword, head word, lemma, or sometimes catchword is the word under which a set of related dictionary or encyclopaedia entries appears. The headword is used to locate the entry, and dictates its alphabetical position. Depending on the size and nature of the dictionary or encyclopedia, the entry may include alternative meanings of the word, its etymology and pronunciation, compound words or phrases that contain the headword, and encyclopedic information about the concepts represented by the word.
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Noun
1. a word that is qualified by a modifier
(synonym) head word
(hypernym) content word, open-class word
(part-holonym) phrase
2. a word placed at the beginning of a line or paragraph (as in a dictionary entry)
(hypernym) word
(part-holonym) lexical entry, dictionary entry

headword
danh từ từ đầu (đề mục); từ đầu mục từ (ở từ điển)
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ESPONENTE. LEMMA