Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word diplomatum could not be parsed. Trying a normal dictionary lookup:
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† dī̆plōma, ătis (dat. and abl. plur. regul. diplomatibus, Tac. H. 2, 65; Plin. Ep. 10, 122; Suet. Aug. 50; Murat. Inscr. 885, 4), n., = δίπλωμα, a letter folded double, viz.,
‡ diplōmārĭus, ii, m. [diploma], one who carried out the imperial letters of recommendation, Inscr. Orell. 2917.