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rosidae
Science; General science
A former widely recognized subclass of Magnoliophyta (angiosperms or flowering plants). Deoxyribonucleic acid (DNA) and morphological studies have demonstrated that this group ...
matrix mechanics
Science; General science
A formulation of quantum theory in which the operators are represented by time-dependent matrices. For a discussion of quantum-mechanical operators and other information ...
panderichthys
Science; General science
A fossil lobe-finned (sarcopterygian) fish from rock strata of the Baltic region dating to the Middle–Late Devonian Period (about 372–368 million years ago), which provides key ...
permineralization
Science; General science
A fossilization, or taphonomic, process characterized by the deposition of a mineral or mineraloid (an amorphous “gel mineral”) in the pore spaces of an organism's body ...
momentum
Science; General science
A foundational quantity in physics that is always conserved in isolated systems, defined in classical mechanics as the product of mass and velocity. An equivalent definition that ...
pantograph
Science; General science
A four-bar parallel linkage, with no links fixed, used as a copying device for generating geometrically similar figures, larger or smaller in size, within the limits of the ...
analytic hierarchy
Science; General science
A framework for solving a problem. The analytic hierarchy process is a systematic procedure for representing the elements of any problem. It organizes the basic rationality by ...
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