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# definition of the word manifold

by the Wiktionnary

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Manifold
 Singular manifold Plural manifolds

manifold (plural manifolds)

1. (now historical) A copy made by the manifold writing process.
2. (mechanics) A pipe fitting or similar device that connects multiple inputs or outputs.
3. (US regional, plural) The third stomach of a ruminant animal, an omasum.
• 1830 Anson, Somerset Co. Me., accessed 12 June 2007
My conjecture being right he will find the third stomach, or manifolds, the seat of difficulty.
4. (mathematics) A topological space that looks locally like the "ordinary" Euclidean space $\mathbb{R}^n$ and is a Hausdorff space.

 Definition from WiktionaryContent avaible with GNU Free Documentation License