D defs.my
Entry 2 senses Webster, 1913

headword

· IPA /ˈhɛdwɝd/
01 n. a word that is qualified by a modifier.
  1. 1.
    a word that is qualified by a modifier.
  2. 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.