Columbia Encyclopedia

(Encyclopedia) escape velocity, the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun. A body given less than the escape velocity will f...

(Encyclopedia) lawn, grass turf or greensward cultivated in private yard or public park. A good lawn, or green, has both beauty and usefulness; its maintenance for golf, tennis, baseball, and other sports is a costl...

(Encyclopedia) Allah ălˈə, äˈlə [key], [Arab.,=the God]. Derived from an old Semitic root refering to the Divine and used in the Canaanite El, the Mesopotamian ilu, and the biblical Elohim, the word Allah is u...

(Encyclopedia) horse-radish, perennial herb (Armoracia rusticana, but sometimes classified in other genera) of the family Cruciferae (or Brassicaceae; mustard family), native to central and S Europe (where it has lo...

(Encyclopedia) poison hemlock, lethally poisonous herbaceous plant (Conium maculatum) of the family Umbelliferae (parsley family). It has rank, finely divided foliage, flat-topped clusters of small white flowers, an...

(Encyclopedia) bugbane, any plant of the genus Cimicifuga, tall north-temperate perennials of the family Ranunculaceae (buttercup family). The white spirelike bloom has a rank odor that attracts flies, which pollina...

(Encyclopedia) elecampane ĕlˌəkămpānˈ [key], hardy Old World herb, Inula helenium, of the family Asteraceae (aster family), naturalized in America and sometimes cultivated in gardens. It has showy yellow-rayed...

(Encyclopedia) trigonometry [Gr.,=measurement of triangles], a specialized area of geometry concerned with the properties of and relations among the parts of a triangle. Spherical trigonometry is concerned with the ...

(Encyclopedia) reserpine rĕsûrˈpēn [key], alkaloid isolated from the root of the snakeroot plant (Rauwolfia serpentina), a small evergreen climbing shrub of the dogbane family native to the Indian subcontinent. ...

(Encyclopedia) chicory sŭkˈərē [key], Mediterannean herb (Cichorium intybus) of the family Asteraceae (aster family), naturalized in North America, where the tall stalks of usually blue flowers are common along ...