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nervous system
(Encyclopedia)CE5 Nerve cell CE5 Nervous system nervous system, network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of ...cone, in mathematics
(Encyclopedia)CE5 Cone cone or conical surface, in mathematics, surface generated by a moving line (the generator) that passes through a given fixed point (the vertex) and continually intersects a given fixed c...Petrokrepost
(Encyclopedia)Petrokrepost shlüˈsəlbo͝orkh [key], town and fortress, NW European Russia, E of St. Petersburg. The town, the terminus of a railroad and of the lateral canals on Lake Ladoga, has shipbuilding and ...leech
(Encyclopedia)leech, predacious or parasitic annelid worm of the class Hirudinea, characterized by a cylindrical or slightly flattened body with suckers at either end for attaching to prey. The leech, like other an...Psilotophyta
(Encyclopedia)Psilotophyta sīlōˌtŏfˈətə [key], division of vascular plants consisting of only two genera, Psilotum and Tmesipteris, with very few species. These plants are characterized by the lack of roots,...Etna
(Encyclopedia)Etna or Aetna both: ĕtˈnə [key], volcano, 10,958 ft (3,340 m) high, on the east coast of Sicily, S Italy. One of the most active volcanoes in the world, it also is the highest active volcano in Eur...honey buzzard
(Encyclopedia)honey buzzard, common name for several medium-sized, buzzardlike hawks (genus Pernis) of Eurasia and Africa. The European honey buzzard, Pernis apivorus, is predominantly reddish brown, and its tail i...Saint Helens, Mount
(Encyclopedia)Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before its 1980 eruption) high, SW Wash., historically the most active volcano in the Cascade Range. Dormant since 1857, Mt. St....spinal column
(Encyclopedia)spinal column, bony column forming the main structural support of the skeleton of humans and other vertebrates, also known as the vertebral column or backbone. It consists of segments known as vertebr...cuttlefish
(Encyclopedia)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 graspin...Browse by Subject
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