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sponge

(Encyclopedia)sponge, common name for members of the aquatic animal phylum Porifera, and for the dried, processed skeletons of certain species used to hold water. Over 4,500 living species are known; they are found...

court tennis

(Encyclopedia)court tennis, indoor racket and net game of ancient origin. It is believed to have originated (about the 14th cent.) in medieval France and is the forerunner of most modern racket games. In its early ...

Crookes tube

(Encyclopedia)Crookes tube, device invented by Sir William Crookes (c.1875) consisting essentially of a sealed glass tube from which nearly all the air has been removed and through the walls of which are passed two...

cyclosis

(Encyclopedia)cyclosis sīklōˈsĭs [key], streaming of cytoplasm within a living cell without deformation of the external cell membrane. In some plant cells there is a rapid rotatory cytoplasmic movement, which i...

Coanda effect

(Encyclopedia)Coanda effect or wall-attachment effect, the tendency of a moving fluid, either liquid or gas, to attach itself to a surface and flow along it. As a fluid moves across a surface a certain amount of fr...

embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

Antiope

(Encyclopedia)Antiope ăntīˈəpē [key], in Greek mythology. 1 Theban princess, daughter of Nycteus. She was seduced by Zeus and bore him twin sons, Zethus and Amphion. Fleeing to Sicyon to escape the wrath of he...

Livorno

(Encyclopedia)Livorno lē vôrˈnô [key], Brit. Leghorn, city (1991 pop. 167,512), capital of Livorno prov., Tuscany, central Italy, on the Ligurian Sea and on the Aurelian Way. It is a busy commercial, industrial...

Nemrut, Mount

(Encyclopedia)Nemrut, Mount, Turk. Nemrut Dağ, mountain in SE Turkey, in the Anti-Taurus Mts. Rising 7,052 ft (2,150 m), it is the site of the mausoleum of Antiochus I (c.69–c.34 b.c.), king of ancient Commagene...

pneumothorax

(Encyclopedia)pneumothorax no͞omōthôrˈăks [key], collapse of a lung with escape of air into the pleural cavity between the lung and the chest wall. The cause may be traumatic (e.g., gunshot or stab wound), spo...