Definition
An archaic Latin legal term appearing in early English legal texts meaning a weapon. The term derives from the Latin *arma* (arms, weapons) and appears in medieval English legal records and treatises to denote an instrument of force or violence. In its qualified form, *armum molutum* — a sharpened or ground weapon — the term distinguished edged or pointed weapons from other instruments capable of causing harm.
The term has no operative place in modern law and functions today exclusively as a term of historical and textual reference.
Common Confusion
ARMUM should not be conflated with the broader Latin *arma*, which in classical and medieval usage could refer collectively to arms, military equipment, or the implements of war generally. ARMUM in the legal sources appears as a singular noun referring to a specific weapon rather than arms in the aggregate sense. Researchers encountering *arma* in medieval writs or pleadings should not assume the more specific meaning attached to ARMUM in Bracton's usage.
Why It Matters in Research
This term appears almost exclusively in the context of early English common law materials, particularly in treatises from the thirteenth century. Researchers working in the Law Mind corpus with medieval plea rolls, early writs of trespass, or texts derived from or commenting on Bracton will encounter ARMUM in formulaic pleading language — most often in the phrase *vi et armis* (by force and arms), which was a standard allegation in trespass actions.
The critical navigational point: *vi et armis* pleading language persisted in English and American common law forms long after the underlying Latin was understood by virtually no practitioner. Corpus researchers tracing trespass doctrine or the development of common law pleading will find ARMUM embedded in these formulaic allegations across centuries of materials. Its meaning in that context is fixed and narrow — it signals a weapon or forcible instrument, the presence of which elevated a trespass from ordinary civil wrong toward criminal character.
The qualified form *armum molutum* (sharp weapon) in Bracton carries specific significance in the context of felonious assault and mayhem analysis. Bracton used the distinction between sharp weapons and blunt instruments to assess the gravity of wounds and thus the character of the offense. Researchers examining the early law of mayhem, bodily harm, or the differentiation of felony from lesser offense should note this distinction when reading Bracton's text at the folios cited.
There is no significant jurisdictional variation to track — this is a term of dead legal Latin without living application in any modern jurisdiction.
Historical Dictionary Support
Burrill is the primary historical dictionary source for this term in the Law Mind corpus. His entry is brief but accurate: he correctly identifies ARMUM as a Latin term used in old English law to mean a weapon, provides the qualified form *armum molutum* for a sharp weapon, and cites Bracton at folios 138 and 145 — citations that researchers can verify against Bracton's *De Legibus et Consuetudinibus Angliae*.
Burrill's entry, like most historical dictionary treatments of archaic Latin terms, does not analyze the term's function within pleading doctrine or its relationship to the *vi et armis* formula. That doctrinal context is essential for any researcher who encounters ARMUM not as an isolated term but as part of operative legal language. The entry is a useful pointer to Bracton but should not be treated as a complete account of the term's role in medieval English legal procedure.
No other Law Mind shelf dictionaries provide entries for ARMUM. Researchers requiring deeper treatment should consult Bracton directly, as well as secondary scholarship on the early common law of trespass and the history of *vi et armis* pleading.