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edelweiss

(Encyclopedia) edelweissedelweissāˈdəlvīs [key], perennial aster plant (genus Leontopodium) found at high altitudes in the mountains of Europe, Asia, and South America. It is about 6 in. (15.2 cm)…

Canada balsam

(Encyclopedia) Canada balsam, yellow, oily, resinous exudation obtained from the balsam fir. It is an oleoresin (see resin) with a pleasant odor but a biting taste. It is a turpentine rather than a…

zinc oxide

(Encyclopedia) zinc oxide, chemical compound, ZnO, that is nearly insoluble in water but soluble in acids or alkalies. It occurs as white hexagonal crystals or a white powder commonly known as zinc…

airglow

(Encyclopedia) airglow, faint diffuse illumination of the sky originating in the upper atmosphere. Although it occurs at all times of day throughout the upper atmosphere, it is most typically visible…

hawkweed

(Encyclopedia) hawkweed, any species of the genus Hieracium of the family Asteraceae (aster family), widely distributed perennials, chiefly of open fields. The small, dandelionlike flower heads are…

sidewinder

(Encyclopedia) sidewinder, common name for a rattlesnake, Crotalus cerastes, found in the deserts of the SW United States. This 2-ft (60-cm), pale yellow and pink snake is named for its curious…

Bard, John

(Encyclopedia) Bard, John, 1716–99, American physician, persuaded New York to establish on Bedloe Island its first quarantine station and was himself the first health officer. He wrote on yellow…