from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A very intricate puzzle of pieces that lock together.
- noun Something very difficult or complex.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun slang, idiomatic A senseless
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun intricate or ingenious puzzle consisting of boxes within boxes
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