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Varna

(Encyclopedia)Varna värˈnä [key], city (1993 pop. 307,200), E Bulgaria, on the Black Sea. It is a major port and an industrial center. Manufactures include ships and boats, chemicals, electrical equipment, and t...

inflection

(Encyclopedia)inflection, in grammar. In many languages, words or parts of words are arranged in formally similar sets consisting of a root, or base, and various affixes. Thus walking, walks, walker have in common ...

Pinophyta

(Encyclopedia)Pinophyta pīˌnŏfˈətə [key], division of the plant kingdom consisting of those organisms commonly called gymnosperms. The gymnosperms, a group that includes the pine, have stems, roots and leaves...

Hubel, David Hunter

(Encyclopedia)Hubel, David Hunter hyo͞oˈbəl [key], 1926–2013, American neurobiologist, b. Ontario, Canada, to American parents. In 1958, Hubel joined Torsten Wiesel at Johns Hopkins; the two relocated to Harva...

solar plexus

(Encyclopedia)solar plexus, dense cluster of nerve cells and supporting tissue, located behind the stomach in the region of the celiac artery just below the diaphragm. It is also known as the celiac plexus. Rich in...

ectoderm

(Encyclopedia)ectoderm, layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. This outer layer, together with the endoderm, or inner layer, is present in all ear...

connective tissue

(Encyclopedia)connective tissue, supportive tissue widely distributed in the body, characterized by large amounts of intercellular substance and relatively few cells. The intercellular material, or matrix, is produ...

fuel cell

(Encyclopedia)fuel cell, electric cell in which the chemical energy from the oxidation of a gas fuel is converted directly to electrical energy in a continuous process (see oxidation and reduction). The efficiency ...

paramecium

(Encyclopedia)paramecium parəmēˈsĭəm [key], unicellular organism of the genus Paramecium, of the ciliate phylum Ciliophora found in freshwater throughout the world. Like other protozoans, paramecia, previously...

urinalysis

(Encyclopedia)urinalysis yo͝orˌənălˈĭsĭs [key], clinical examination of urine for the purpose of medical diagnosis. Urine is initially examined for such characteristics as color, odor, and specific gravity. ...