Definition
In medical jurisprudence, a bruise is a contusion — an injury to the flesh caused by a blunt or heavy instrument that does not break the skin or produce a visible wound in the surface tissue. The legal definition turns on the absence of laceration: the skin remains intact while underlying tissue is damaged. A bruise is distinguished from a cut, puncture, or other injury involving a break in the skin.
The term appears most frequently in criminal law (assault, battery, homicide investigations) and tort law (personal injury damages) as a descriptive category of bodily harm.
Common Language
Modern common usage (Wiktionary): A purplish mark on the skin due to leakage of blood from capillaries under the surface that have been damaged by a blow; also, a dark mark on fruit or vegetables caused by a blow to the surface.
Historical common usage (Webster's 1913): To injure, as by a blow or collision, without laceration; to contuse. Also, to break or crush in a mortar.
The legal and common definitions are largely aligned in substance, but the legal definition is more precise in one important respect: it focuses on the mechanical cause (blunt instrument, absence of skin breach) and forensic classification rather than the visible result. A common speaker identifies a bruise by what it looks like; a legal or medical-jurisprudence source defines it by how it was produced and what tissue layers are affected. In forensic and evidentiary contexts, this distinction matters — discoloration alone may not legally qualify as a bruise if causation is uncertain.
Common Confusion
Bruise and contusion are used interchangeably in most legal sources and are treated as synonyms in both Black's and Bouvier's. No meaningful legal distinction exists between the terms in modern usage. Researchers should not assume that a historical source using one term is drawing a substantive line against the other.
Bruise should be distinguished from laceration (a wound involving torn or cut skin) and abrasion (damage to the surface layer of skin by friction or scraping). These distinctions carry weight in criminal charging, medical examiner reports, and damages assessments, where the type of wound can affect the inference about the instrument used or the degree of force applied.
Why It Matters in Research
BRUISE is a term of medical jurisprudence, not a standalone legal doctrine. Researchers encounter it in three primary contexts:
First, in criminal law sources — particularly assault, battery, mayhem, and homicide — where the nature of the injury (bruise versus wound, contusion versus laceration) affects the elements of the offense, the severity of the charge, or the sufficiency of the evidence. Historical criminal law sources often required specific wound types to elevate a simple assault to a more serious charge, and the bruise/laceration distinction was doing real work in those analyses.
Second, in tort and personal injury materials, where bruising is categorized as a class of physical harm for damages purposes. Historical pleading forms and damages schedules sometimes enumerated injury types, and the bruise-as-contusion category appears in those lists.
Third, in forensic and medical-jurisprudence treatises housed within the Law Mind corpus. When reading nineteenth-century medical jurisprudence materials, researchers should be alert to the fact that "bruise" carries a technical meaning tighter than its everyday sense — the absence of skin disruption is definitionally important, not merely descriptive.
One navigational trap: the corrupted text in the Black's 1st edition source record runs the BRUISE entry into adjacent broker-related entries. This is a digitization artifact. The BRUISE entry in Black's 1st edition is substantively identical to the 2nd edition definition.
Historical Dictionary Support
All three historical sources agree on the core definition: a bruise is a contusion caused by a blunt or heavy instrument, without breaking the skin. Bouvier phrases it as "an injury done with violence to the person, without breaking the skin" and expressly notes its near-synonymy with contusion. Black's 2nd edition adds the phrase "without solution of continuity," a technical medical-jurisprudence formula meaning no breach in the continuity of the skin surface — a more precise articulation of the same idea.
None of the historical dictionaries treat BRUISE as a term of art with independent legal significance; all three locate it squarely within medical jurisprudence as a classificatory concept borrowed from forensic medicine. What the historical sources do not address is the evidentiary and probative role of bruising in criminal prosecutions — how courts used bruise evidence, how medical witnesses testified to contusions, or how bruising interacted with burden of proof in assault cases. Researchers needing that context will need to move from the dictionary entries into treatises and case reporters.
Jurisdictional Note
No significant jurisdictional variation exists in the definition of bruise as a medical-jurisprudence term. Variation arises instead in how specific criminal statutes define "bodily injury" or "physical harm," which may or may not track the bruise/laceration distinction. Researchers working in a specific jurisdiction should verify the operative statutory definition of injury rather than relying on the common-law classification.
Encyclopedia Cross-Reference
Law Mind Encyclopedia — Medical Jurisprudence (forensic classification of wounds and injuries)
Law Mind Encyclopedia — Battery (bodily harm element; relationship between injury type and offense)
Law Mind Encyclopedia — Personal Injury Damages (categories of compensable physical harm)