equitans
راكبrākib (pl. rukkāb)
n. rkb – traveller, voyager (sc. by sea)-  Albu. Coni. tr. V, li. 209: significat evasionem equitantium in mari 
-  Albu. Coni. tr. V, li. 805: significat equitantes mare evadere a submersione Yama.: دلّ على سلامة ركّاب البحر من الغرق 
- 5 Albu. Coni.
This sense of the Latin term is not documented in MLW, DMLBS and LLNMA.