Source : Webster's Revised Unabridged Dictionary (1913)

Subcontrary \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.

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