Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A material similar to thick, stiff paper, that is made of pressed paper pulp or pasted sheets of paper. It is used for making cartons and signs, for example.
  • adjective Made of or consisting of cardboard.
  • adjective Flimsy; insubstantial.
  • adjective Lacking depth; superficial.

from The Century Dictionary.

  • noun A stiff kind of paper made by pasting together two or more thicknesses of paper, drying and pressing; a thin pasteboard.
  • noun A thin board, with a short handle, 5 inches wide and 12 inches long, to which is fastened card-clothing for carding wool, cotton, and the like by hand.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A stiff compact pasteboard of various qualities, for making cards, etc., often having a polished surface.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A wood-based material resembling heavy paper, used in the manufacture of boxes and signs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective without substance
  • noun a stiff moderately thick paper

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

card + board

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