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NACREOUS

A term applied to the lustre of certain minerals, usually on crystal faces parallel to a good cleavage, the lustre resembling that of pearls,

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NACREOUS CLOUDS

Clouds composed of ice crystals in

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NACRITE

A species of clay mineral, identical in composition with kaolinite, from which it differs in certain optical characters and in atomic structure.

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NADIR

Pole of the horizon vertically below the observer; hence the point on the celestial sphere diametrically opposite the zenith.

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NAEVUS

A birthmark or mole. 1 A pigmented tumour in the skin. 2 A patch or swelling in the skin composed of small dilated blood vessels,

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NAGANA

A name for a group of animal diseases in Africa caused by trypanosomes. Also fly disease, tsetse fly disease.

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NAGGING PIECE

A horizontal timber between the studs in a partition.

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NAIL

In higher mammals, a horny plate of epidermal origin taking the place of a claw at the end of a digit.

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NAIL PUNCH

A small steel rod tapering at one end, used to drive the head of a nail beneath the surface of the timber. Also nail set.

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NAKED

Lacking a structure or organ,

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