Definition of "posterboard" [posterboard]

• Cardboard material suitable for making posters. (noun)
• A piece of such material. (noun)
• A flyer printed on stiff cardboard, approximately 8.5 by 11 inches, mailed flat. (noun)

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• "I had no idea – beyond the most rudimentary, high-school sex-ed posterboard kind of understanding – what might be the implications of circumcising or not circumcising."
• "Artist Eric Daigh, 33 year old husband, father born in California and now residing in Northern Michigan, creates portraits by putting ordinary pushpins in posterboard."
• "One man held a posterboard saying, "you a traitor sic.""