tractōrĭus — Lewis & Short
tractōrĭus, a, um, adj.traho.
I Of or for drawing or hoisting:
genus machinarum,Vitr. 10, 1.—
II Substt.: tractō-rĭa, ae, f. (sc. epistula), a letter of invitation or summons, Aug. Ep. 217.—
B trac-tōrĭae, ārum, f. (sc. litterae), an imperial letter containing an order to provide a person with necessaries on his journey:
de tractoriis et stativis,Cod. Just. 15, 52.