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| Latency Period |
| | The period of time between an exposure and onset of toxicity. |
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| Lipid |
| | A large and diverse group of organic compounds that contain primarily carbon and hydrogen atoms with a lesser amount of oxygen. Most lipids are insoluble in water but will readily dissolve in other lipids and in organic solvents. |
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| Lipid Soluble |
| | Capable of being dissolved in fat or in solvents that dissolve fat. Usually non-ionized compounds. |
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| Lipophilic |
| | Having an affinity for fats or lipids. A substance that is lipophilic has high lipid solubility and can penetrate cell membranes by passive diffusion. |
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| Lipophilicity |
| | A term used to describe the ability of a substance to dissolve in, or associate with, fat and therefore living tissue. This usually applies to substances that are non-ionized or non-polar or have a non-polar portion. High lipid solubility usually implies low water solubility. |
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