Source : Webster's Revised Unabridged Dictionary (1913)

Inarch \In*arch"\, v. t. [imp. & p. p. {Inarched}; p. pr. & vb.
   n. {Inarching}.]
   To graft by uniting, as a scion, to a stock, without
   separating either from its root before the union is complete;
   -- also called to {graft by approach}. --P. Miler.