Definitions

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Conic Sections) The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See focus, and parameter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin latus ("side") + rectum ("right")

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