Columbia Encyclopedia

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oath

(Encyclopedia)oath, vocal affirmation of the truth of one's statements, generally made by appealing to a deity. From the earliest days of human history, calling upon the gods of a community to witness the truth of ...

lettuce

(Encyclopedia)lettuce, annual garden plant (Lactuca sativa and varieties) of the family Asteraceae (aster family), probably native to the East Indies or Asia Minor, possibly as a derivative of the widespread weed c...

living will

(Encyclopedia)living will or advance health care directive, legal document in which a person expresses in advance his or her wishes concerning the use of artificial life support and other medical treatment should t...

meristem

(Encyclopedia)meristem mĕrˈistĕmˌ [key], a specialized section of plant tissue characterized by cell division and growth. Much of the mature plant's growth is provided by meristems. Apical meristems found at th...

rowing

(Encyclopedia)rowing, the art of propelling a boat by means of oars operated by hand. Boats propelled by oars (e.g., the galley) were used in ancient times for both war and commerce. Rowing is now generally used on...

corner

(Encyclopedia)corner, securing of all or nearly all the supply of any commodity or stock so that its buyers are forced to pay exorbitant prices. Corners may be planned deliberately or may be brought about unintenti...

degree, academic

(Encyclopedia)degree, academic, title bestowed upon a student on the fulfillment of certain requirements or given as an honor to an eminent person. The practice of awarding degrees originated in the universities of...

transit instrument

(Encyclopedia)transit instrument or transit, telescope devised to observe stars as they cross the meridian and used for determining time. Its viewing tube swings on a rigid horizontal axis restricting its movements...

gall, in botany

(Encyclopedia)gall, abnormal growth, or hypertrophy, of plant tissue produced by chemical or mechanical (e.g., the rubbing together of two branches) irritants or hormones. Chemical irritants are released by parasit...

hostage

(Encyclopedia)hostage, person held by another as a guarantee that certain actions or promises will or will not be carried out. During periods of internal turmoil, insurgents often seize hostages; recent examples in...