| occupational exposure |
| The occupational exposure is a standard term that concerns adult workers in good health, with a possible exposure of 8 hours per day, 5 days a week, 11 months per year. |
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| Occupational Exposure Limit (OEL) |
| General term for concentration of air contaminants above which people should not be exposed at work. Most often, an OEL refers to the airborne concentration of a substance averaged over a reference period, such as an 8 hour workshift, or over a 15 minute period during a work shift where peak exposures may occur, which if not exceeded is unlikely to lead to adverse health effects in exposed workers, when exposed daily over a standard working lifetime. |
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| occupational illness |
| Any abnormal condition or disorder – other than one resulting directly from an accident – caused by, or mainly caused by, work-related factors and recognised during the year as part of national schemes or regulations. |
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| Occupational Illness Frequency Rate (OIFR) |
| The number of cases of occupational illness per million working hours. This parameter is reportable for employees only. |
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| octane |
| For a gasoline engine to work efficiently, gasoline must burn smoothly without premature detonation, or knocking. Severe knocking can dissipate power output and even cause damage to the engine. When gasoline engines became more powerful in the 1920s, it was discovered that the most extreme knocking effect was produced by a fuel composed of pure normal heptane, while the least knocking effect was produced by pure isooctane. This discovery led to the development of the octane scale for defining gasoline quality. |
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| ODC |
| Oxygen Depolarised Cathode. |
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| ODETTE |
| Organisation for Data Exchange by TeleTransmission in Europe. |
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| ODP |
| See Ozone Depletion Potential (ODP). |
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| OECD |
| Organisation for Economic Co-operation and Development. |
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| OECD HPV Chemicals Programme |
Launched by the OECD for initial risk assessment of High Production Volume chemicals; has been replaced by the refocused OECD HPV Chemicals Programme.
ALSO: HPV Programme. |
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| OECD SIDS Programme |
| See OECD HPV Chemicals Programme (correct name). |
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| OEL |
| See Occupational Exposure Limit (OEL). |
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| OES |
| Occupational Exposure Standard. |
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| oestradiol |
| Oestradiol is a female sex hormone of importance during the menstrual cycle and pregnancy. It plays a role in the development of typical female body characteristics such as the formation of breasts, soft skin, sexual organs and the pattern of fat distribution. It has high oestrogenic activity as a sex hormone. |
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| oestrogen |
| Oestrogens are hormones which are primarily produced in sexually mature female animals. They regulate the development of typical female characteristics (e.g. breast development) and the onset of the oestrus cycle. Small levels of oestrogens are also found in males. |
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| oestrone |
| In the body oestradiol is converted to oestrone. It is a female sex hormone, but its activity is less than that of oestradiol. |
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| oestrus |
| Menstrual cycle is the monthly female cycle during which the womb (uterus) is prepared for the implantation of a fertilised egg cell. If fertilisation does not occur, the inside lining of the uterus is shed, resulting in the loss of blood. In animals the period during which the female is receptive to the male animal is termed oestrus. |
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| OH |
| Occupational Health. |
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| OHS |
| Occupational Health and Safety. |
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| OIE |
| Office International des Epizooties – International Office for Animal Health. |
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