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Nolvadex (tamoxifen)

An antiestrogen (a drug that blocks the effects of estrogen) which competes with estrogen for binding sites in target tissues such as breast. Tamoxifen has been widely publicized. It was approved by the US Food and Drug Administration (FDA) to treat breast cancer and help prevent it in women at high risk for the disease […]

Nomenclature

A system of names used in a particular discipline, as in medicine and surgery, anatomy and biochemistry, etc. A standard system of nomenclature presupposes the existence of an organized classification of the entities within that field. From the Latin nomenclatura, a listing of names, from nomen, name, + calo, to proclaim. The USSR and other […]

Nystagmus

Rapid, rhythmic, repetitious, and involuntary eye movements. Nystagmus can be horizontal, vertical, or rotary. Whatever form it takes, nystagmus is an abnormal eye finding and a sign of disease within the eye or the nervous system.

Nymph

A stage in the life cycle of certain arthropods, such as ticks and lice. The nymph stage is between the nit and the adult louse stages. A nymph louse looks like an adult but is smaller. Nymphs mature into adults about 7 days after hatching. To live, the nymph must feed on blood.

Nyctanopia

Impaired vision in dim light and in the dark, due to impaired function of the rods in the retina. Nyctanopia is a classic finding with vitamin A deficiency. Also known as day sight, nocturnal amblyopia, and nyctalopia.

Nyctalopia

Night blindness, impaired vision in dim light and in the dark, due to impaired function of certain specialized vision cells (the rods) in the retina. “Nyctalopia” comes from the Greek “nyct” (night) + “aloas” (obscure or blind) + “opsis” (vision). Nyctalopia is also called day sight, nocturnal amblyopia, and nyctanopia.

nvCJD

New variant Creutzfeldt-Jakob disease.

Nutritionist

1) In a hospital or nursing home, a person who plans and/or formulates special meals for patients. It can also simply be a euphemism for a cook who works in a medical facility but who does not have extensive training in special nutritional needs. 2) In clinical practice, a specialist in nutrition. Nutritionists can help […]

Nutritional neuroscience

The field of nutrition that relates to the central and peripheral nervous system. Nutritional neuroscience includes the role of different components of the normal diet (protein, carbohydrate, fat), dietary supplements (minerals, vitamins, hormones, herbs), and food additives (artificial flavors, colors, sweeteners) on neurochemistry, neurobiology, behavior, and performance.

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