OSAC Lexicon
The OSAC Lexicon is a compendium of forensic science terms and definitions. This terminology tool was created to help bring consistency and understanding to the way terms are used by the various forensic science. Use of the OSAC Lexicon does not replace the need to reference the original published source.
The terms and definitions in the OSAC Lexicon come from the published literature, including documentary standards and technical reports. It is continually updated with the latest work from OSAC units, as well as terms from newly published documentary standards and standards elevated to the OSAC Registry.
Gradually terms are evaluated and harmonized by the OSAC to a single term. This process results in an OSAC Preferred Term. An OSAC Preferred Term is a term, along with its definition, that has undergone review and evaluation by the FSSB Terminology Task Group and has been approved by the FSSB. The FSSB recommends that subcommittees use OSAC Preferred Terms when drafting standards.
The OSAC Lexicon should be the primary resource for terminology and used when drafting and editing forensic science standards and other OSAC work products.
Genotype
The entire genetic constitution of an individual; also, the alleles present at one or morespecific loci.
Genus
A level of taxonomic classification that defines a group of related species.
genus
The level of taxonomic classification that defines a group of related species.
genus
The level of taxonomic classification that defines a group of related species.
geotaphonomic
Conditions that reflect how the buried body or evidence affects the surrounding environment.
Gingival Dental Emergence
The interval in the migration process from a tooth's initial appearance through the gingival soft tissue to the point of final eruption.
Glass
Glowing Combustion
Luminous burning of solid material without a visible flame.
GLP
Good Laboratory Practice. The United States has rules for GLP in 21CFR58. TheOrganization for Economic Co-operation and Development (OECD) has stated principlesof GLP.
GMT
Greenwich Mean Time.
GPS
Global Positioning System.
Grain
Grains
grand jury
A group of citizens empaneled to investigate potential criminal conduct and/or determine whether probable cause exists to charge someone with a crime.
Grating
Grayscale Image, Greyscale Image
Grayscale Transformation, Greyscale Transformation
Green Dog
Ranges from an untrained canine up to but not including a certified canine. (See novice dog.)
Grid Search
A type of systematic pattern used to ensure thorough coverage of a defined area.
Grooves
gross examination
Visual (macroscopic) assessment of skeletal and dental materials.
Ground
A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and earth or to some conducting body that serves in place of the earth.
Ground Fault
A current that flows outside the normal circuit path, such as (1) through the equipment grounding conductor; (2) through conductive material in contact with lower potential (such as earth), other than the electrical system ground (metal water or plumbing pipes, etc.); or (3) through a combination of these ground return paths.
Guide
A document that is advisory or informative in nature and that contains only nonmandatory provisions. A guide may contain mandatory statements such as when a guide can be used, but the document as a whole is not suitable for adoption into law.
Guideline
Recommended practice that allows some discretion or leeway in its interpretation, implementation, or use. A set of general principles used to provide direction and parameters for decision making.
Gunpowder
Gunshot Residue (GSR)
Habit
Habituation
The lessening or disappearance of a response that was once elicited by the stimulus with repeated presentation of the same or closely related stimulus.
Hair
Hair Follicle
hand stamp
A stamp that requires a separate ink pad when making impressions.
Handler
The handler is a person who has successfully completed a documented training and certification process in canine handling in the specific discipline of ignitible liquid canine detection and maintains those abilities through field application, maintenance training, scheduled recertification, and continuing education. (See 3.4.2, Certification.) [SC1, 2011].
Handler
See canine handler.
Handler Error
Any action or cue made by the handler that causes the canine to perform incorrectly. (See canine handler error.)
Handler Error
Any action or cue made by the handler that causes the canine to perform incorrectly. (See 3.13 canine handler error.)
Handler Error
Any action or cue made by the handler that causes the canine to perform incorrectly. (See canine handler error.)
Handler Error
Any action or cue made by the handler that causes the canine to perform incorrectly. (See 3.13 canine handler error.)
Haplogroup
A group of similar haplotypes that share a common ancestor with a single-nucleotide polymorphism mutation.
Haplotype
A set of linked DNA variations, or polymorphisms, that tend to be inherited together (e.g., commonly used for human Y-chromosome or mitochondrial analysis). A haplotype can refer to a combination of alleles or to a set of single nucleotide polymorphisms (SNPs) found on the same chromosome.
Haplotype
A set of linked DNA variations, or polymorphisms, that tend to be inherited together (e.g. commonly used for mitochondrial or Y-chromosome analysis). A haplotype can refer to a combination of alleles or to a set of single nucleotide polymorphisms (SNPs) found on the same chromosome.
haplotype
A set of linked DNA variations, or polymorphisms, that tend to be inherited together; a combination of alleles or a set of single nucleotide polymorphisms (SNPs) found on the same chromosome.
Hardy-Weinberg Equilibrium
A state in which allele and single locus genotype frequencies do not change (on average) from one generation to the next in a population. When alleles in a population are independent, allele and genotype frequencies are related through the Hardy-Weinberg principle: for a locus with 2 alleles P and Q at frequencies of p and q, homozygotes for P are found at frequency p2, homozygotes for Q are found at a frequency of q2, and heterozygotes are found at a frequency of 2pq. Use of the theta correction removes the need to assume Hardy-Weinberg equilibrium in the population for which a frequency database is constructed.
Hash, Hash Value
Hashing Function
Hasty Search
A quick search or rapid assessment of the defined area.
Hazard
A condition that presents the potential for harm or damage to people, property, or the environment.
Hazardous Material
A substance (solid, liquid, or gas) that when released is capable of creating harm to people, the environment, and property.
Hazardous Materials
Any material that is an air-reactive material, flammable or combustible liquid, flammable gas, corrosive material, explosive material, organic peroxide, oxidizing material, radioactive material, toxic material, unstable material, biological material or water-reactive material, and any substance or mixture of substances that is an irritant or a strong sensitizer or that generates pressure through exposure to heat, decomposition, or other means.