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illumination, in physics
(Encyclopedia)illumination, in physics: see lighting; photometry. ...hoya, in botany
(Encyclopedia)hoya: see milkweed.hyacinth, in botany
(Encyclopedia)hyacinth, any plant of the genus Hyacinthus, bulbous herbs of the family Liliaceae (lily family) native to the Mediterranean region and South Africa. The common, or Dutch, hyacinth of house and garden...hydra, in zoology
(Encyclopedia)hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish stre...horn, in music
(Encyclopedia)horn, in symphonic and chamber music: see French horn. ...horn, in zoology
(Encyclopedia)horn, in zoology, one of a pair of structures projecting from the head of a hoofed animal, used chiefly as a weapon. In cattle, sheep, Old World antelopes, and related animals the horns are permanent ...iris, in anatomy
(Encyclopedia)iris: see eye.iris, in botany
(Encyclopedia) CE5 Red iris, Iris fulva iris, common name for members of the genus Iris of the Iridaceae, a family of perennial herbs that includes the crocuses, freesias, and gladioli. The family is characteriz...Islam in Africa
(Encyclopedia)Islam in Africa, the development of the Muslim religion on the African continent. During Muhammad's lifetime a group of Muslims escaped Meccan persecution (615) by fleeing to Ethiopia, where the Negus...induction, in logic
(Encyclopedia)induction, in logic, a form of argument in which the premises give grounds for the conclusion but do not necessitate it. Induction is contrasted with deduction, in which true premises do necessitate t...Browse by Subject
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