Definition
A Law French term denoting a cheat or deceiver — specifically, one who fraudulently passed off inferior or counterfeit goods as genuine. The word appears in Britton (the late-thirteenth-century English legal treatise) in connection with those who sold base metals or alloys as precious ones: pewter sold as silver, or latten (a brass-like alloy) sold as gold. GILOUR is a historical term of art describing a category of commercial fraudster recognized in early English law, not a term in active modern use.
Common Language
Modern common usage (Wiktionary): Not listed as a current English word.
Historical common usage (Webster's 1913): "A guiler; deceiver. [Obs.]"
The Webster's entry confirms the word survived in general English as a synonym for "deceiver" before falling entirely out of use. The legal meaning is narrower: in Britton's usage, GILOUR is not a generic deceiver but specifically a fraudulent tradesman engaged in the substitution of counterfeit goods — a commercial fraud category, not merely a moral characterization.
Why It Matters in Research
GILOUR is a dead-letter term — it will not appear in modern statutes, case reporters, or contemporary secondary sources. Its research value is almost entirely historical and taxonomic.
Researchers working in early English legal history, particularly texts from the late thirteenth and early fourteenth centuries, will encounter the term in Britton and potentially in related treatises of the same period. Britton (c. 1291–1292) was one of the earliest English-language expositions of the common law, written in Law French, and its categories of commercial wrongdoing reflect a period before fraud, deceit, and related torts had achieved stable doctrinal form. GILOUR names a recognizable social problem — adulteration and substitution of goods — that later legal development addressed through the action of deceit, warranty doctrine, and ultimately statutory fraud regimes.
For corpus researchers, the term is a pointer to a cluster of related medieval commercial wrongs. Encountering GILOUR in a primary source signals proximity to discussions of market regulation, the assize of weights and measures, and the guild-era policing of trade quality — all of which generated a distinct body of early common law and local custom. The term does not map cleanly onto any single modern cause of action; it straddles what would later be separated into fraud, misrepresentation, and consumer protection.
Traps for researchers: The Law French spelling varies. GILOUR, GYLOUR, and GUILOR appear across different manuscript traditions and dictionary transcriptions. A corpus search limited to one spelling may miss relevant passages. Additionally, Burrill's entry runs GILOUR together with an entry for GIPPEWICUS (Ipswich) due to typographical formatting in the original — a reminder that historical dictionary transcriptions can introduce errors that affect automated corpus parsing.
Historical Dictionary Support
All three source dictionaries — Black's (1st ed.), Black's (2nd ed.), and Burrill's — give essentially identical definitions, each tracing the term to Britton chapter 15 and citing the pewter-for-silver / latten-for-gold examples verbatim. There is no substantive divergence among them.
The uniformity is itself informative: none of the dictionaries attempts to connect GILOUR to a living doctrine or trace its lineage into later fraud law. By the time these dictionaries were compiled, the term was already a pure antiquarianism — preserved for completeness and historical literacy, not for practical application. Black's retains it across editions without elaboration, suggesting the editors regarded the Britton reference as self-contained.
What the historical dictionaries do not address is the broader legal context in Britton: the chapter in which GILOUR appears deals with local commercial regulation and the duties of officials to police market fraud — a context that would help a researcher understand the term as part of a regulatory, not purely private-law, framework. Researchers should consult Britton directly (in translation if necessary) rather than relying solely on the dictionary gloss.
Webster's 1913 treats the word as obsolete even in ordinary English, consistent with its disappearance from legal use well before the modern period.