A geometric surface that resembles or is related to a cylinder, often describing a type of ruled surface in mathematics.
From 'cylind-' (related to cylinder, from Greek kylindros, roller) plus '-oid' (Greek suffix meaning resembling or similar to). Created in 19th-century mathematics to describe shapes.
Cyclindroid surfaces were crucial to engineers designing everything from turbine blades to architectural domes—they found that surfaces 'like but not quite' cylinders could be both strong and beautiful!
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