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  • O

    The chemical symbol for oxygen as a singlet. aka the free radical.

  • O2

    The chemical symbol for oxygen gas.

  • O3

    The chemical symbol for ozone gas.

  • oblique fracture

    An injury in which the fracture line crosses the bone at an oblique angle.

  • occipital

    The region of the back part of the head.

  • occlusion

    Stoppage, as of a blood vessel by a clot.

  • occlusive dressing

    A watertight or airtight covering for a wound.

  • Occupancy

    Zoning and safety code term used to determine how a structure is permitted to be used and occupied, which in turn dictates the necessary safety structures and procedures.

  • Occupancy

    (1) General term for a building, structure, or residence (2) Building code classification based on the use to which owners or tenants put buildings or portions of buildings; regulated by the various building and fire codes

  • Occupancy

    (1) General term for a building, structure, or residence (2) Building code classification based on the use to which owners or tenants put buildings or portions of buildings; regulated by the various building and fire codes

  • Occupancy class

    General categories of structures for purpose of safety planning, such as for hospital, assembly, industrial, single-family dwelling, apartment building, commercial, etc. Further broken down by types of hazards associated with particular occupancies, such as gas stations.

  • Occupancy Classification

    Classifications given to structures by the model code used in that jurisdiction based on the intended use for the structure

  • Occupancy Classification

    Classifications given to structures by the model code used in that jurisdiction based on the intended use for the structure

  • Occupant

    Person who lives in, uses, occupies, or has other possession of an apartment, house, or other premise

  • Occupant

    Person who lives in, uses, occupies, or has other possession of an apartment, house, or other premise

  • Occupant Load

    Total number of people who may occupy a building or portion of a building at any one given time

  • Occupant Load

    Total number of people who may occupy a building or portion of a building at any one given time

  • Occupant use hose

    Light-weight 1«" diameter firehose pre-coupled to standpipe for emergency use by building occupants prior to arrival of firefighters. Often accessible by breaking glass to unlock a secure enclosure.

  • Occupantional Safety and Health Administration (OSHA)

    U.S. agency that develops and enforces standards and regulations for occupational safety in the workplace; division of the U.S. Department of Labor (DOL)

  • Occupantional Safety and Health Administration (OSHA)

    U.S. agency that develops and enforces standards and regulations for occupational safety in the workplace; division of the U.S. Department of Labor (DOL)

  • ocular

    Pertaining to the eyes.

  • OD

    An abbreviation with several meanings; overdose, outside diameter, oculus dexter (right eye). The specific meaning is usually clear in context.

  • odontoid process

    A toothlike structure projecting from the second cervical vertebra.

  • Offensive attack

    Method of firefighting in which water or other extinguishing agent is taken by firefighters, directly to the seat of the fire, as opposed to being pumped in that general direction from a safe distance. Typified by taking hoselines to the Read on! →

  • Officer’s Tool

    A lock pulling device.

  • ointment

    A semisolid substance used externally, usually containing medication.

  • oliguria

    Minimal urine output. Generally less than 30 ml/hr. A foley is generally needed to measure hourly output.

  • On-call

    Personnel who can be summoned (and paid) when necessary to respond to an incident; a type of "volunteer" fire department.

  • One-hour fuel

    Vegetation with large surface-to-mass ratio, a so-called "fine fuel" (along with 10-hour) that quickly reaches critical (inflammable) moisture levels (fine fuel moisture, FFM) when exposed to heat

  • open fracture

    A fracture involving disruption of the skin over the fracture site; a

  • open pneumothorax

    A pneumothorax caused by an opening in the chest wall; a sucking chest wound.

  • Open Web Joist

    A joist constructed with a web composed of materials such as bars or tubes that not fill the entire web space. These are very common building assemblies because of their strength compared to their cost. When exposed to fire they Read on! →

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