(ふくだい)

ふくだい
noun
subtitle, secondary title
1. subtitle, secondary title
A secondary or supplementary title that appears alongside the main title of a book, article, film, or other work. Provides additional context or clarification for the main title. Not to be confused with movie subtitles (字幕(じまく)).
この(ほん)副題(ふくだい)(なん)です
What is the subtitle of this book?
Academic papers often have subtitles.
The film's subtitle captures its content well.

Refers to a secondary title of a work (such as the text after a colon in a book title), not to movie/TV subtitles displayed on screen. For on-screen subtitles, use 字幕(じまく).

Common patterns

Forms

(ふく) (secondary, vice-) + (だい) (title). The prefix (ふく)〜 appears in many words: 副社長(ふくしゃちょう) (vice president), 副作用(ふくさよう) (side effect).

Similar term: サブタイトル (subtitle, loanword) is interchangeable in casual contexts.