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| Explanation of rheumatoid arthritis (noun) form: no plural chronic disease of the joints Sample of rheumatoid arthritis Rheumatoid arthritis leads to stiffness, pain, weakness and deformity of the joints.
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| Explanation of chromium (noun) form: no plural Group 2 metallic element Sample of chromium Chromium is used to make alloys and steel.
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| Explanation of coma (noun) form: no plural unconscious state Sample of coma A person in a coma is not dead.
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| Explanation of actin (noun) form: no plural protein component of muscle fibers Sample of actin Actin and myosin are both needed to make a muscle bundle contract.
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| Explanation of nicotine (noun) form: no plural a chemical in tobacco Sample of nicotine Nicotine is addictive. There is moderate reduction in lung cancer risk associated with lower tar cigarettes but research in the UK suggests that the assumed health advantages of switching to lower tar may be largely offset by the tendency of smokers to compensate for the reduction in nicotine (cigarettes lower in tar also tend to be lower in nicotine) by smoking more or inhaling more deeply
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| Explanation of menses (noun) form: only plural the blood and other substances lost from the uterus at menstruation Sample of menses Heavy painful menses is called menorrhagia.
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| Explanation of osteoclast (noun) form plural: osteoclasts a bone cell that helps destroy bone Sample of osteoclast An osteoclast (from the Greek words for "bone" and "broken") is a type of bone cell that removes bone tissue by removing the bone's mineralized matrix.
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| Explanation of snore (noun) form plural: snores noise made during sleep which keeps others awake Sample of snore Loud snores could be heard from the room next door.
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| Explanation of actinide series (noun) form: only plural 15 radioactive elements Sample of actinide series Atomic numbers of the actinide series increases from actinium to lawrencium.
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| Explanation of thiamine (noun) form: no plural vitamin B1 Sample of thiamine Thiamine deficiency is common in alcoholics.
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