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	siphon siphon , tube through which a liquid is lifted over an elevation by the pressure of the atmosphere and is then emptied at a lower level. To start the siphon, it must first be filled with the liquid before it is placed into position. The elevation over which a siphon will lift a liquid is limited by... Read more
	William Thomson 1st Baron Kelvin William Thomson Kelvin, 1st Baron 1824-1907, British mathematician and physicist, b. Belfast. He was professor of natural philosophy at the Univ. of Glasgow (1846-99). He is known especially for his work on heat and electricity. In thermodynamics his work of coordinating the theories of heat held... Read more
	tunicate tunicate , marine animal of the phylum Chordata , which also includes the vertebrates. The adult form of most tunicates (also called urochordates) shows no resemblance to vertebrate animals, but such a resemblance is evident in the larva. The most familiar tunicates are the sea squirts, or... Read more
	Yellow-green algae Xanthophyta The yellow-green algae are photosynthetic species of organisms belonging to the Xanthophyta Phylum, which is one of the phyla pertaining to the Chromista Group in the Protista Kingdom. Xanthophyta encompasses 650 living species so far identified. Xanthophyta live mostly in freshwater,... Read more
	cuttlefish cuttlefish common name applied to cephalopod mollusks that have 10 tentacles, or arms, 8 of which have muscular suction cups on their inner surface and 2 that are longer and can shoot out for grasping prey, and a reduced internal shell enbedded in the enveloping mantle. The body is short, broad,... Read more
	giant clam giant clam common name for the largest bivalve mollusk in the world, Tridacna gigas, also known as the bear's paw clam. The giant clam may weigh over 500 lb (225 kg) and attain a length of over 4 ft (120 cm). The heavy shell is coarsely fluted and toothed. Giant clams are found in the South... Read more
	Heterodonta Heterodonta (phylum Mollusca, class Bivalvia) A subclass of bivalves which have heterodont dentition consisting of a hinge plate with distinct cardinal teeth below the umbo, and lateral teeth posterior to the cardinals. Some forms may be desmodont. The ligament is opisthodetic. Shell shape varies... Read more
	siphonaceous siphonaceous (siphoneous) Applied to algae in which the thallus is not divided up by septa, i.e. the many nuclei are not compartmentalized into cells. The typical siphónaceous alga has a large central vacuole surrounded by a layer of protoplasm, containing nuclei and chloroplasts, which lines... Read more
	Bobby Charlton Bobby Charlton (Sir Robert Charlton), 1937-, one of the most celebrated of all English soccer players. Famous for his graceful athleticism, powerfully accurate kick, and sportsmanlike behavior, Charlton was (1954-73) a forward for Manchester United, making his pro debut in 1956. He survived the... Read more
	Freddy Adu Adu, Freddy June 2, 1989 • Tema, Ghana Soccer player Freddy Adu is like any average teenager. He goofs around with his friends, enjoys going to the movies, loves PlayStation, and hates doing his homework. Unlike most kids, however, he earns about $500,000 a ... Read more