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pontoon
(Encyclopedia) pontoon, one of a number of floats used chiefly to support a bridge, to raise a sunken ship, or to float a hydroplane or a floating dock. Pontoons have been built of wood, of hides…parrotfish
(Encyclopedia) parrotfish, common name for a member of a large group of colorful reef fishes of warm seas, resembling the wrasses but of a larger size. Long considered a separate family, Scaridae,…solar cell
(Encyclopedia) solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper…snowball earth
(Encyclopedia) snowball earth, hypothesized condition in which the earth was covered completely by ice during several periods in the Proterozoic. The hypothesis was originally developed to explain…Qumran
(Encyclopedia) QumranQumrank&oomacr;mränˈ [key], ancient village on the northwest shore of the Dead Sea, in what is now the Israeli-occupied West Bank. It is famous for its caves, in some of…Native American languages
(Encyclopedia) Native American languages, languages of the native peoples of the Western Hemisphere and their descendants. A number of the Native American languages that were spoken at the time of…coronavirus
(Encyclopedia) coronavirus, any of a group (family Coronaviridae, subfamily Orthocoronavirinae) of enveloped single-stranded RNA viruses that have a crownlike or sunlike appearance under an electron…Holocene epoch
(Encyclopedia) Holocene epochHolocene epochhŏlˈəsēn [key] or Recent epoch, most recent of all subdivisions of geologic time, ranging from the present back to the time (c.11,000 years ago) of almost…Hippocrates
(Encyclopedia) HippocratesHippocrateshĭpŏkˈrətēz [key], c.460–c.370 b.c., Greek physician, recognized as the father of medicine. He is believed to have been born on the island of Cos, to have studied…feathers
(Encyclopedia) CE5 Structure of a bird feather feathers, outgrowths of the skin, constituting the plumage of birds. Feathers grow only along certain definite tracts (pterylae), which vary in…Trending
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