Definition
A wharf or paved structure built along navigable water — a harbor, river, or similar waterway — used for the loading and unloading of cargo carried in ships. In its legal sense, a quay is not merely the physical structure but the surrounding ground appropriated for public commercial use. At its broadest, a quay may encompass the entire space between the waterfront and the first row of buildings in a city. So much of that space as is necessary for the public convenience of maritime commerce is treated as public property and cannot be privately appropriated; the remainder may be held as private property.
The word is sometimes spelled "key" in older legal and commercial sources.
Common Language
Modern common usage (Wiktionary): A stone or concrete structure on navigable water used for loading and unloading vessels; a wharf.
Historical common usage (Webster's 1913): A mole, bank, or wharf, formed toward the sea, or at the side of a harbor, river, or other navigable water, for convenience in loading and unloading vessels.
The common definition treats a quay as a physical structure. The legal definition expands the term to include the surrounding ground appropriated for public commercial use — a distinction with real property consequences. A researcher encountering "quay" in a property or admiralty dispute should not assume the term refers only to the dock itself.
Why It Matters in Research
The central research trap is the physical-versus-territorial distinction. Common usage and early dictionary definitions focus on the structure. Legal usage, especially in property and admiralty contexts, extends the term to encompass the adjacent public ground. Bouvier makes this explicit: the quay in its enlarged sense runs from the waterfront to the first row of city buildings. That broader definition directly affects questions of public access rights, municipal ownership, riparian grants, and the limits of private appropriation along navigable waterfronts.
Researchers working in early American and French-influenced jurisdictions — particularly Louisiana — should note the civil law background of this term. Burrill traces the word to French marine law and the Ordonnance de la Marine, which governed French and colonial commerce. In Louisiana cases and statutes, "quay" carries this civil law freight and may be interpreted against that civilian backdrop rather than the common law understanding.
The spelling variant "key" appears in older commercial records, conveyances, and port documents. A corpus search limited to "quay" will miss instances where the term is recorded as "key," and vice versa. Both spellings should be searched in any historical document review.
The public/private boundary within a quay — public where commerce requires, private as to the surplus — generated significant litigation over waterfront grants and municipal dedications. When a deed or charter grants rights in or over a "quay," the question of how far that public dedication extends is a live interpretive issue, not settled by the physical footprint of the dock alone.
Historical Dictionary Support
The five source dictionaries agree on the core: a quay is a waterfront structure for loading and unloading goods. They diverge on scope.
Black's (both editions) anchors the legal definition in the public-use dimension, quoting from a federal case for the proposition that the popular and commercial meaning of "quay" involves ground appropriated to public use. Anderson's tracks that same public-use language without elaboration.
Bouvier goes furthest, offering the "enlarged sense" that extends the quay to the full span between waterfront and the first city buildings. This is the most expansive definition in the set and reflects civilian and commercial port-city usage, particularly relevant in Louisiana. Bouvier also articulates the public/private split within that space — an analytical point absent from the other entries.
Burrill contributes the French law provenance, locating the term in the Ordonnance de la Marine and situating it within French harbor law. This is the only entry to explicitly flag the civil law origin, which matters for any researcher working with pre-statehood Louisiana sources or French colonial maritime records.
What the historical sources do not address: the term's relationship to statutory port authority, modern harbor improvement districts, or any distinction between a quay and a pier or wharf for purposes of liability or regulatory jurisdiction. Those distinctions require modern statutory and regulatory research beyond these dictionaries.
Jurisdictional Note
Louisiana stands apart due to its civil law tradition and the French marine law origin of the term. In that jurisdiction, "quay" in historical documents should be read against the Ordonnance de la Marine and Louisiana's own riparian and public-use doctrines rather than common law wharf-and-dock rules. In common law jurisdictions, the term functions largely interchangeably with "wharf" or "dock," though statutory definitions in port and harbor legislation may assign specific meanings.