Definition
A vessel whose principal motive power is steam rather than sails or other means of propulsion. The distinction between steam and sail is legally significant because it affects classification under admiralty and maritime law, applicable statutes governing vessel registration and inspection, and the liability rules that attach to carriers operating different types of craft. A steamship is a type of vessel and a type of ship, but not all vessels or ships qualify as steamships — the steam-propulsion element is the operative distinction.
Common Language
Modern common usage (Wiktionary): A ship or vessel propelled by steam power.
Historical common usage (Webster's 1913): A ship or seagoing vessel propelled by the power of steam; a steamer.
The common and legal meanings are closely aligned, but the legal definition adds a comparative qualifier — steam must be the *principal* motive power, not merely an auxiliary one. A vessel fitted with both a steam engine and sails was not automatically a steamship in the legal sense; the dominant propulsion method controlled classification. This distinction mattered practically when statutes imposed inspection requirements, licensing obligations, or liability rules specifically on steamships.
Common Confusion
STEAMSHIP vs. VESSEL vs. SHIP: These terms are not interchangeable in legal sources. "Vessel" is the broadest category and includes craft that would not qualify as ships or steamships. "Ship" historically referred to a seagoing vessel of significant size and was often defined without regard to motive power. "Steamship" or "steamboat" is the narrowest category, defined by propulsion method. Researchers encountering statutes or cases that use one term should not assume the rule extends to the others without checking the specific statutory or common-law definitions in context. Bouvier's directs readers to cross-reference SHIP and VESSEL separately, acknowledging they are related but distinct.
STEAMSHIP vs. STEAMBOAT: Period sources sometimes use these interchangeably, but in American legal usage — particularly under federal inspection statutes — "steamboat" was often the term of art for steam-powered vessels operating on inland waters, while "steamship" more commonly referred to ocean or coastal vessels. The distinction affected which regulatory regime applied.
Why It Matters in Research
The legal significance of "steamship" in the Law Mind corpus is largely historical and statutory. From the mid-nineteenth century through the early twentieth century, steamships were the dominant subject of maritime commerce litigation and federal regulatory action. Researchers should be aware of several navigational issues:
First, liability rules for steamship owners and operators were actively contested during this period, particularly around the treatment of passengers and their personal property. Bouvier's notes directly that a steamboat owner is not an innkeeper and therefore does not bear innkeeper liability for property stolen from passengers — a rule that distinguished maritime carriers from land-based hospitality operators. This was a live question in nineteenth-century case law and the answer was not always obvious to courts.
Second, federal steamship inspection statutes — enacted and repeatedly amended across the nineteenth century following catastrophic boiler explosions — created a distinct regulatory category for steam-powered vessels. Whether a particular vessel fell within or outside that category determined whether federal inspectors had jurisdiction and whether statutory damages provisions applied.
Third, the transition from steam to internal combustion and diesel propulsion in the early twentieth century rendered "steamship" as a legal category increasingly obsolete. Researchers working with twentieth-century sources should watch for statutes that updated terminology or extended older steamship rules to motor vessels by amendment or judicial construction.
Fourth, Rapalje & Lawrence's entry as provided does not contain a substantive definition of steamship — the text supplied appears to be a fragment from an unrelated entry. Researchers relying on Rapalje & Lawrence for this term should treat it as providing no independent guidance and consult Bouvier's instead.
Historical Dictionary Support
Bouvier's provides the most useful period definition: a vessel whose principal motive power is steam, not sails. The entry cites an English Queen's Bench authority and a Pennsylvania case, and it flags the innkeeper liability issue with a Massachusetts citation. This structure reflects how nineteenth-century legal dictionaries functioned — the definition itself is brief, and the operative legal content is carried by the case references appended to it.
Bouvier's cross-references to SLEEPING-CAR, SHIP, and VESSEL are genuinely instructive for corpus researchers. The sleeping-car cross-reference reflects a recurring nineteenth-century doctrinal question: what duty of care does a transportation operator owe to passengers and their property? Courts worked out analogous rules for railroads and steamships in parallel, and the sleeping-car cases illuminate the steamship passenger-property cases and vice versa.
Neither Bouvier's nor the available Rapalje & Lawrence text addresses the regulatory dimension of the term — the federal inspection statutes and the Coast Guard predecessor agencies that administered them. That gap is significant; the administrative and statutory law of steamship safety was among the most developed areas of federal regulation in the nineteenth century and is not well captured by dictionary definitions alone.
Jurisdictional Note
Federal admiralty jurisdiction governed steamships in interstate and international commerce, but state law retained a significant role for vessels operating exclusively on intrastate waters. The line between federal and state regulatory authority over steam-powered vessels was contested throughout the nineteenth century. Researchers working with state court decisions involving steamships should confirm whether federal law had preemptive effect on the specific rule at issue.