(in letterpress printing) a layer of packing, typically of paper, placed between the platen and the paper to be printed to equalize the pressure over the whole forme (凸版印刷)压纸格;衬垫
(Architecture). another term for tympanum (建筑)。 同 tympanum
语源
late 16th cent. (in sense 1): from French tympan or Latin tympanum (see tympanum). Sense 2 dates from the early 18th cent