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Meaning of nowhere-dense

no•where-dense

Pronunciation: (nō'hwâr-dens', -wâr-), [key]
— adj. Math.
  1. (of a set in a topological space) having a closure that contains no open set with any points in it; nondense.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.