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elevator

Science; General science

A platform or enclosure that is raised and lowered in a vertical hoistway to transport freight or people. The term elevator can also encompass all of the hoisting equipment, ...

shear center

Science; General science

A point on a line parallel to the axis of a beam through which any transverse force must be applied to avoid twisting of the section. A beam section will rotate when the ...

polyacetal

Science; General science

A polyether derived from aldehydes (R=CH 2 or CHR′) or ketones (R=C(R′R′)) and containing –O–R–O– groups in the main chain. Of the many possible polyacetals, the most ...

dextran

Science; General science

A polyglucose biopolymer characterized by preponderance of α-1,6 linkage, and generally produced by enzymes from certain strains of Leuconostoc or Streptococcus . The chemical ...

prism

Science; General science

A polyhedron of which two faces are congruent polygons in parallel planes, and the other faces are parallelograms (see illus .). The bases B are the congruent polygons; the ...

lignin

Science; General science

A polymer found extensively in the cell walls of all woody plants; is one of the most abundant natural polymers. Lignin, which constitutes one-fourth to one-third of the total ...