tympan

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tympan

[′tim·pən]
(graphic arts)
One or more layers of paper placed on the impression surface of a printing press to improve presswork quality.
References in periodicals archive ?
Favreau, "Les inscriptions du tympan de la Cathedrale de Jaca", Academie des Inscriptions et Belles-Lettres (1996), pp.
237-241: "Les premiers tympans sculptes" y 241-256: "Une collection de chefs-d'oeuvre: les grands tympans").
Un concert assourdissant de klaxons fusent de partout au point de faire mal aux tympans.