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platen (n.)

1540s, "flat plate of metal," from French plateine, from Old French platine "flat piece, metal plate" (13c.), perhaps altered (by influence of plat "flat") from patene, from Latin patina "pan; broad, shallow dish," from Greek patane "plate, dish" (from PIE root *pete- "to spread"). From 1590s as "the flat part of a press which comes down upon the form and by which the impression is made." Hence, on a typewriter, "cylindrical roller or other surface against which the paper is held" (1890).

 

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Definitions of platen from WordNet

platen (n.)
work table of a machine tool;
platen (n.)
the flat plate of a printing press that presses the paper against the type;
platen (n.)
the roller on a typewriter against which the keys strike;
From wordnet.princeton.edu