Lewis & Short

lēgŭlēïus, i, m. [lex], a pettifogging lawyer, pettifogger, one who depends on legal technicalities for getting the better of his opponent: leguleius quidam cautus et acutus, Cic. de Or. 1, 55, 236: formularii, vel ut Cicero ait, leguleii, Quint. 12, 3, 11.