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jellyfish

(Encyclopedia)jellyfish, common name for the free-swimming stage (see polyp and medusa), of certain invertebrate animals of the phylum Cnidaria (the coelenterates). The body of a jellyfish is shaped like a bell or ...

madder

(Encyclopedia)CE5 Bluet, Houstonia caerulea, a member of the madder family madder, common name for the Rubiaceae, a family of chiefly tropical and subtropical trees, shrubs, and herbs, especially abundant in N ...

kangaroo

(Encyclopedia)kangaroo, name for a variety of hopping marsupials, or pouched mammals, of the family Macropodidae, found in Australia, Tasmania, and New Guinea. The term is applied especially to the large kangaroos ...

myrtle

(Encyclopedia)myrtle, common name for the Myrtaceae, a family of shrubs and trees almost entirely of tropical regions, especially in America and Australia. The family is characterized by leaves (usually evergreen) ...

diode

(Encyclopedia)diode dīˈōd [key], two-terminal electronic device that permits current flow predominantly in only one direction. Most diodes are semiconductor devices; diode electron tubes are now used only for a ...

artificial intelligence

(Encyclopedia)artificial intelligence (AI), the use of computers to model the behavioral aspects of human reasoning and learning. Research in AI is concentrated in some half-dozen areas. In problem solving, one mus...

Maeterlinck, Maurice

(Encyclopedia)Maeterlinck, Maurice môrēsˈ mätĕrlăNkˈ [key], 1862–1949, Belgian author who wrote in French. After practicing law unsuccessfully for several years, he went to Paris in 1897. He had already be...

koan

(Encyclopedia)koan kōˈän [key] [Jap.,=public question; Chin. kung-an], a subject for meditation in Ch'an or Zen Buddhism, usually one of the sayings of a great Zen master of the past. In the formative period of ...

Attenborough, Sir David Frederick

(Encyclopedia)Attenborough, Sir David Frederick, 1926–, British naturalist and television personality. After serving in the Royal Navy (1947–49), he worked as an editor, then joined the BBC (1952) as a producer...

aniline

(Encyclopedia)aniline ănˈəlĭn [key], C6H5NH2, colorless, oily, basic liquid organic compound; chemically, a primary aromatic amine whose molecule is formed by replacing one hydrogen atom of a benzene molecule w...