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The word trossulus could not be parsed. Trying a normal dictionary lookup:
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Trossŭli, ōrum, m., a name given to the Roman cavalry, from Trossulum, a town of Etruria, which was conquered by them, Varr. ap. Non. 49, 3; cf.: Junius Gracchanus in Plin. 33, 2, 9, § 36; Fest. p. 367 Müll.
In sing., Pers. 1, 82 Schol.
In the Aug. per., a name used in contempt for fops, coxcombs, Sen. Ep. 87, 9; so id. ib. 76, 2.