prorostrum Save DMLBS prorostrum [CL pro-+rostrum] 1 (in gl.) ‘beak’ of ship (used for ramming). ~um, prominens pars navis Osb. Glouc. Deriv. 473. 2 (in gl.) ‘rostrum’, speakers’ platform in Roman Forum. ~um ‥ locus in foro Osb. Glouc. Deriv. 473.