\Sub*con"tra*ry\, a.
1. Contrary in an inferior degree.
2. (Geom.) Having, or being in, a contrary order; -- said of
   a section of an oblique cone having a circular base made
   by a plane not parallel to the base, but so inclined to
   the axis that the section is a circle; applied also to two
   similar triangles when so placed as to have a common angle
   at the vertex, the opposite sides not being parallel.
   --Brande & C.
3. (Logic) Denoting the relation of opposition between the
   particular affirmative and particular negative. Of these
   both may be true and only one can be false.

\Sub*con"tra*ry\, n.; pl. {Subcontraries}. (Logic)
A subcontrary proposition; a proposition inferior or contrary
in a lower degree.