portu
portu is a Latin form of portus, meaning “harbor, port; haven, refuge”. It is the ablative singular masculine noun.
Found 206 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 3.14.2: Quae ubi convenit ac primum ab hostibus visa est, circiter CCXX naves eorum paratissimae atque omni genere armorum ornatissimae profectae ex portu nostris adversae constiterunt;
All forms of portus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.