from The Century Dictionary.
- noun In geometry, the envelop of a sphere touching three fixed spheres.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Geom.) A surface of the fourth degree, having certain special relations to spherical surfaces. The tore or anchor ring is one of the cyclides.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mathematics Any of a class of
surfaces, described by quarticexpressions, that are related to sphericalsurfaces
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