decoderbook
nounUK /diːˈkəʊdə bʊk/
US /diːˈkoʊdər bʊk/
A book that helps you figure out secret codes and hidden messages.
She used her decoderbook to read the secret message from her friend.
RELATED WORDS
OTHER MEANINGS
2. A guide that explains how to understand a special language or set of symbols.
The spy carried a decoderbook to translate the strange symbols.
3. A book of answers that helps you solve tricky puzzles or riddles.
He checked the decoderbook when he got stuck on the last riddle.
4. A reference book that explains difficult words or ideas in simple terms.
The teacher gave us a decoderbook to help with the hard science words.