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Webster 1913 Edition

Noun.

(Geom.)

The part of the axis contained between the ordinate and tangent drawn to the same point in a curve.

Noun.

In geometry, the part of the axis contained between the ordinate and tangent drawn to the same point in a curve.

subtangent ‎(plural subtangents)

(geometry) The part of the axis contained between the ordinate and tangent drawn to the same point in a curve.