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woad

(Encyclopedia)woad, name for a perennial plant (Isatis tinctoria) of the family Cruciferae (or Brassicaceae; mustard family) and for a blue dye obtained from its leaves. The plant is believed to be native to S Russ...

Bahr el Azraq

(Encyclopedia)Bahr el Azraq, river, Sudan: see Blue Nile. ...

hogback

(Encyclopedia)hogback, sharp-crested ridge with steep slopes on both sides, formed by the erosion of steeply tilted rock layers. Hogbacks are commonly formed along the eroded flanks of large, tightly folded anticli...

kame

(Encyclopedia)kame kām [key], low, steep, rounded hill or ridge of layered sand and gravel drift, developed from glacial deposits. Kames were probably formed by streams of melting glacial ice that deposited mud an...

Amano, Hiroshi

(Encyclopedia)Amano, Hiroshi, 1960–, Japanese physicist, Ph.D. Nagoya Univ., Japan, 1989. He is a professor at Nagoya Univ. in Japan. Amano is the joint recipient with Shuji Nakamura and Isamu Akasaki of the 2014...

flame test

(Encyclopedia)flame test, test used in the identification of certain metals. It is based on the observation that light emitted by any element gives a unique spectrum when passed through a spectroscope. When a salt ...

flying dragon

(Encyclopedia)flying dragon, gliding lizard of the genus Draco, found in tropical forests of SE Asia. There are about 15 species. Most are about 8 in. (20 cm) long. On either side of the lizard's body are thin, win...

Australian cattle dog

(Encyclopedia)Australian cattle dog, breed of medium-sized herding dog developed in Australia. It stands from 18 to 20 in. (45.7–50.8 cm) high at the shoulder and weighs about 33 lb (15 kg). Its double coat consi...

old English sheepdog

(Encyclopedia)old English sheepdog, breed of large, wiry working dog developed in England in the early 19th cent. It stands from 21 to 25 in. (53.3–63.5 cm) high at the shoulder and weighs from 55 to 65 lb (24.9�...

tallit

(Encyclopedia)tallit tälētˈ [key], in Judaism, four-cornered, fringed shawl worn by males during the morning prayers. It is donned before putting on the phylacteries, except on Yom Kippur when it is worn all thr...