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diseases of plants

(Encyclopedia)diseases of plants. Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rot...

District of Columbia

(Encyclopedia)District of Columbia, federal district (2020 pop. 689,545), 69 sq mi (179 sq km), on the east bank of the Potomac River, coextensive with the city of Wa...

division of labor

(Encyclopedia)division of labor, in economics, the specialization of the functions and roles involved in production. Division of labor is closely tied with the standardization of production, the introduction and pe...

Doctrine of Signatures

(Encyclopedia)Doctrine of Signatures, the concept that the key to humanity's use of various plants was indicated by the form of the plant. The red sap of the bloodroot (Sanguinaria canadensis), for instance, was be...

Allen, Bog of

(Encyclopedia)Allen, Bog of, area of several peat bogs c.375 sq mi (971 sq km), with patches of cultivable land, in the central lowlands, E Republic of Ireland. The bog is crossed by the Grand and Royal canals. It ...

Donation of Constantine

(Encyclopedia)Donation of Constantine: see Constantine, Donation of. ...

Dublin, University of

(Encyclopedia)Dublin, University of, at Dublin, Ireland; founded 1591 by Queen Elizabeth I of England; also called Trinity College, Dublin. It has faculties of arts (humanities); arts (letters); business, economics...

Commons, House of

(Encyclopedia)Commons, House of: see Parliament. ...

Commonwealth of Australia

(Encyclopedia)Commonwealth of Australia: see Australia. ...

Commonwealth of Nations

(Encyclopedia)Commonwealth of Nations, voluntary association of Great Britain and its dependencies, certain former British dependencies that are now sovereign states and their dependencies, and the associated state...