'Latus rectum' definitions:
Definition of 'Latus rectum'
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Latus rectum \La"tus rec"tum\n. [L., the right side.] (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.
[1913 Webster]
