port

Port, as the left side of a ship, comes from the Latin portus ('harbor, gate'), the same word that gives us 'port' as a place where ships dock. The etymology connects through practice: the port side of a vessel is the side that faces the harbor when docking. Because ships in the era of the steering oar (which was mounted on the right, or starboard, side) needed to present their left side to the dock to avoid damaging the steering gear, the left side became the harbor side, the docking side, the port side. The word 'port' for a harbor and 'port' for the left side of a ship are thus the same word, naming the relationship between the ship's structure and the dockside it consistently faced.

Before 'port' was standardized as the term for the left side, English used 'larboard' — from Old English hlædbord ('the loading board,' the side from which cargo was loaded at harbor). The two terms coexisted for centuries, but 'larboard' created a dangerous ambiguity: shouted in rough conditions, 'larboard' and 'starboard' sounded confusingly similar. The Royal Navy's 1844 order substituting 'port' for 'larboard' was a safety measure — the monosyllabic 'port' could not be confused with the two-syllable 'starboard' even through wind, spray, and the noise of rigging. The harbor came to name the side of the ship in a direct, functional way: port is where you go when you're in port.

The Latin portus is itself a rich word. It named both the physical harbor (an enclosed body of water sheltered for ships) and the gate or doorway — a port was a passage through which goods and people moved. This dual sense survives in English: 'port' as harbor, 'portal' as doorway, 'porter' as one who carries goods through a gate, 'portfolio' (from portare + folium, 'to carry + leaf') as a case for carrying documents. The portus was a controlled opening — a place where the sea's edge was managed, where what entered and what left was monitored and taxed. Every port was also a customs house, a point of surveillance and commerce, a threshold between the maritime and the terrestrial.

Port wine takes its name from Oporto (from O Porto, 'the port' in Portuguese), the city through which wine from the Douro Valley was shipped to England in the seventeenth and eighteenth centuries. The wine named for the harbor became, in British culture, the drink of the after-dinner hour — served after the tablecloth was removed, passed clockwise (to port? — the origin of the clockwise-passing convention is disputed), associated with naval officers and retired gentlemen. Port the wine and port the nautical direction both carry the harbor in their name, one as geography and one as geometry. The Latin portus has distributed itself across the English language in ways that no one word can easily summarize.