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YARN

A thread ie a long thin material made of fibres or filaments usually twisted together,

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YARROW BOILER

A marine water-tube boiler employing an upper steam drum connected by banks of inclined tubes to three lower water drums, between two of which susperheating elements are arranged,

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YAW METER

An instrument, usually on experimental aircraft or missiles, which detects changes in the direction of airflow by the pressure changes induced thereby, or by a weather recording vane transmitting to instruments,

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YAW VANE

A small aerofoil on a pivoted arm at the end of a long boom or probe, attached to the nose of an aircraft or missile, which measures the angle of the relative airflow and transmits it to recording instruments,

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YAWING MOMENT

The component about the normal axis of an aircraft due to the relative airflow,

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YAWS

A contagious tropical disease occurring in children living in hot humid climates, due to infection with Treponema pertenue, and characterized by raspberry-like papules on the skin; as in syphilis, the bones and joints may later become infected. Also framhoesia, pian.

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YEAR

The civil or calendar year as used in ordinary life, consisting of a whole number of days, 365 in ordinary years, and 366 in leap years, and beginning with January 1. See anomalistic. eclipse^ leap , sidereal, tropical.

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YEAST

Unicellular fungus reproducing asexually by budding or division, esp the genera, Saccharomyces and Schizosaccharomyces. Facultative anaerobes, growing in sugar containing products, which have poor tolerance to heat and can be killed by a few minutes

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YEAST ARTIFICIAL CHROMOSOME

A cloning vector that allows long segments of DNA to be cloned, and that is useful in chromosome mapping. Abbrev YAC.

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YEAST EXTRACT

A by-product of the brewing industry. Spent yeasts are hydrolysed and concentrated to produce a food which is high in protein and B vitamins, and can be used as a flavour enhancer,

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