How many letters does the top answer for “supplementary material that is collected and appended at the back of a book” have?

The most common answer is appendix (8 letters).

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Crossword clue: supplementary material that is collected and appended at the back of a book

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

appendix 8 letters wn-def

supplementary material that is collected and appended at the back of a book

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)