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lobefin

(Encyclopedia)lobefin, common name for any of a group of lunged, fleshy-finned, bony fishes, also called crossopterygians, that were dominant in the Devonian period and may have given rise to amphibians. They had h...

MacNeice, Louis

(Encyclopedia)MacNeice, Louis məknēsˈ [key], 1907–63, Irish poet b. Belfast. Educated at Oxford, he became a classical scholar and teacher and later was a producer and traveled the world for the British Broadc...

mahogany

(Encyclopedia)mahogany, common name for the Meliaceae, a widely distributed family of chiefly tropical shrubs and trees, often having scented wood. The valuable hardwood called mahogany is obtained from many member...

limestone

(Encyclopedia)limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making...

melanin

(Encyclopedia)melanin mĕlˈənĭn [key], water-insoluble polymer of various compounds derived from the amino acid tyrosine. It is one of two pigments found in human skin and hair and adds brown to skin color; the ...

musk ox

(Encyclopedia)musk ox, hoofed ruminant mammal, Ovibos moschatus, found in arctic North America and Greenland. The northernmost member of the cattle family (though it is not closely related to true cattle), the musk...

hammerhead

(Encyclopedia)hammerhead, common name for a heavy-looking, heronlike bird, Scopus umbretta. Its plumage is brown with light and dark glossy, purplish streaks on the wings and body. It has short legs, partially webb...

Heizer, Michael

(Encyclopedia)Heizer, Michael, 1944–, American sculptor and painter, b. Berkeley, Calif., studied San Francisco Art Institute (1963–64). Heizer was one of the artists who developed land art in the late 1960s an...

guinea pig

(Encyclopedia)guinea pig gĭnˈē [key], domesticated form of the cavy, Cavia porcellus, a South American rodent. It is unrelated to the pig; the name may refer to its shrill squeal. Guinea pigs were raised by the ...

Eris, in astronomy

(Encyclopedia)Eris, in astronomy, the largest known dwarf planet. Eris, whose highly eccentric elliptical orbit ranges from 38 AU to 97 AU and is inclined more than 44°, is the largest known object of the Kuiper b...