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rock cleavage
Science; General science
A secondary, planar structure of deformed rocks. A cleavage is penetrative and systematic, as opposed to fractures and shear zones which may occur alone or in widely spaced sets. ...
dairy cattle production
Science; General science
A section of animal agriculture concerned with the production of milk and milk products. The mammary gland in mammals was developed for the nourishment of their young. Over the ...
esophagus
Science; General science
A section of the alimentary canal that is interposed between the pharynx and the stomach. Because of divergent specializations in the various vertebrates, the esophagus cannot be ...
oil shale
Science; General science
A sedimentary rock containing solid, combustible organic matter in a mineral matrix. The organic matter, often called kerogen, is largely insoluble in petroleum solvents, but ...
fiord
Science; General science
A segment of a troughlike glaciated valley partly filled by an arm of the sea. It differs from other glaciated valleys only in the fact of submergence. The floors of many fiords ...
intron
Science; General science
A segment of deoxyribonucleic acid (DNA) transcribed into ribonucleic acid (RNA) as part of a longer strand of RNA, called heterogeneous nuclear RNA (hnRNA), but that does not ...
horst
Science; General science
A segment of the Earth's crust, generally long as compared to its width, that has been upthrown relative to the adjacent rocks (see illus. ). Horsts range in size from those ...
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