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XANTHOCHROMJA

Tuffier and Miliau

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XYLENE

2A constituent hydrocarbon of coal nap.ha. It is a colourless liquid of faint odour distinct from that of benzene, of which it is a homo logue. The crude article, of sp. gr. about o

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XANTHOCYTE

A cell secreting u yellow pigment.

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XANTHOLEIN

A yellow coloring-matter obtained from the bark or outer part of Sorghum vul gare, Pers. Cf. Purpurolein.

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XANTHOPLASTY

Plastic surgery for xanthoderma.

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XANTHOSTRUMARIN

A glucosid found by A. Zander in the seeds ofclotburr, Xanthium strumarium, L.

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XANTHOXYLIN

X. Crystals, C10H,jO4, a substance occurring in silky crystals, soluble in alcohol or ether, insoluble in water; melt at 8o

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XENON

A gaseous element discovered by Ramsay and Travers Its relative density is 64. A vacuum tube charged with xenon when excited assumes a sky- blue color. It melts at I400 C. and boils at 109

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XEROPHYTE

A plant indigenous io arid regions.

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XEROSIS

X. epitheliaiis, X. infantilis, X. tnangu

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