WordWeb Online

1. A content word that can be qualified by a modifier
   - head word
    
2. A word placed at the beginning of a line or paragraph (as in a dictionary entry)

1. (grammar) the word in a grammatical constituent that plays the same grammatical role as the whole constituent
   - head

Derived forms: head words, headwords

Type of: content word, open-class word, word

Part of: dictionary entry, lexical entry, phrase

Encyclopedia: Headword