binormal

About 0.01 uses per million words.

Meaning

1. noun A line that is at right angles to both the normal and the tangent of a point on a curve and, together with them, forms three orthogonal axes.
2. adjective Describing such a line.

Similar words

bitangent conjugate axis orthogonal radical axis orbiform normal subnormal radical line antiparallel bisectrix

Often followed by

vector roc model to distribution vectors of unit is