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hepaticopsida
Science; General science
A class of lower green plants called liverworts that belong to the division Bryophyta. The class is divided into approximately 225 genera and 8500 species. Although there is a ...
pycnogonida
Science; General science
A class of marine arthropods, consisting of about 600 Recent and 3 Devonian species. The Pycnogonida, or Pantopoda, are commonly called sea spiders.
silicoflagellata
Science; General science
A class of marine planktonic chromists. Their skeletons are composed of hollow, siliceous rods and (see illus .), resemble those of the Radiolaria, with which they have been ...
amphibolite
Science; General science
A class of metamorphic rocks with one of the amphibole minerals as the dominant constituent. Most of the amphibolites are dark green to black crystalline rocks that occur as ...
tardigrada
Science; General science
A class of microscopic, bilaterally symmetrical invertebrates which are generally less than 1 mm in length. About 400 species are known. Commonly called water bears, bear ...
micro-opto-electro-mechanical systems (MOEMS)
Science; General science
A class of microsystems that combine the functions of optical, mechanical, and electronic components in a single, very small package or assembly. MOEMS devices can vary in size ...
gold
Science; General science
A chemical element, Au, atomic number 79 and atomic weight 196.967, a deep yellow, soft, and very dense metal. Gold is classed as a heavy metal and as a noble metal; commercially, ...
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