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side-necked turtle

(Encyclopedia)side-necked turtle, name for the long-necked turtle of the families Chelidae and Pelomedusidae, found only in the Southern Hemisphere. The neck in these two families is of a different structure from t...

Sierra Nevada, mountain range, United States

(Encyclopedia)Sierra Nevada sēĕrˈə nəväˈdə [key], mountain range, c.400 mi (640 km) long and from c.40 to 80 mi (60–130 km) wide, mostly in E Calif. It rises to 14,495 ft (4,418 m) in Mt. Whitney, the hig...

pleura

(Encyclopedia)pleura plo͝orˈə [key], membranous lining of the upper body cavity and covering for the lungs. The pleura is a two-layered structure: the parietal pleura lines the walls of the chest cage and covers...

phospholipid

(Encyclopedia)phospholipid fŏsˌfōlĭpˈĭd [key], lipid that in its simplest form is composed of glycerol bonded to two fatty acids and a phosphate group. The resulting compound called phosphatidic acid contains...

Radić, Stjepan

(Encyclopedia)Radić, Stjepan stĕˈfän [key], 1871–1928, Croatian politician. Of peasant origin, he early became active in politics and founded (1905) the Croatian Peasant party. In 1918 he opposed the union of...

oxytocin

(Encyclopedia)oxytocin ŏksĭtōˈsĭn [key], hormone released from the posterior lobe of the pituitary gland that facilitates uterine contractions and the milk-ejection reflex. The structure of oxytocin, a cyclic ...

virus

(Encyclopedia)CE5 Structure of a tobacco mosaic virus, an RNA-containing virus virus, parasite with a noncellular structure composed mainly of nucleic acid within a protein coat. Most viruses are too small (100...

Delius, Frederick

(Encyclopedia)Delius, Frederick dēlˈyəs [key], 1862–1934, English composer, of German parentage. Influenced by Grieg, Delius combined romanticism and impressionism in his music, which is characterized by rathe...

allotropy

(Encyclopedia)allotropy əlŏˈtrəpē [key] [Gr.,=other form]. A chemical element is said to exhibit allotropy when it occurs in two or more forms in the same physical state; the forms are called allotropes. Allot...

Cortona, Pietro Berrettini da

(Encyclopedia)Cortona, Pietro Berrettini da pyāˈtrō bār-rĕt-tēˈnē dä kōrtôˈnä [key], 1596–1669, Italian baroque painter and architect, b. Cortona. The Barberini family commissioned him to paint fresc...