One of the mysteries of the English language finally explained.
A movable arm, fixed to the side of a railway carriage, by means of which mailbags can be picked up or deposited while the train is in motion. Usually more fully "traductor arm". Now historical.
Late 17th century (in an earlier sense). From post-classical Latin traductor person who takes something to another place, translator from classical Latin trāduct-, past participial stem of trāducere + -or.
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