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holothuroidea
Science; General science
A class of Echinozoa characterized by a cylindrical body and smooth leathery skin, and known as sea cucumbers. There are no arms, but a ring of five or more tentacles may ...
sigma-delta converter
Science; General science
A class of electronic systems containing both analog and digital subsystems whose most common application is to the conversion of analog signals to digital form and vice versa. ...
earphones
Science; General science
A class of energy transducers capable of receiving alternating current and generating acoustic waves resembling very closely the characteristics of that current. The movement of ...
edrioasteroidea
Science; General science
A class of extinct Echinozoa which arose early in Cambrian times and died out before the end of the Carboniferous Period. They resemble the other Echinozoa in having the ...
blastoidea
Science; General science
A class of extinct Pelmatozoa in the subphylum Blastozoa which arose in the Ordovician and flourished in the Carboniferous and Permian. Blastoids did not survive the ...
ferrimagnetic garnets
Science; General science
A class of ferrimagnetic oxide materials that have the garnet crystal structure. The crystal structure contains three types of nonequivalent sites in the oxygen lattice which are ...
shale
Science; General science
A class of fine-grained clastic sedimentary rocks with a mean grain size of less than 0.0625 mm (0.0025 in.), including siltstone, mudstone, and claystone. One-half to two-thirds ...
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