The Collaborative International Dictionary of English v.0.48:

Polytomous \Po*lyt"o*mous\, a. [Poly- + Gr. ? a cutting, fr. ?
   to cut.] (Bot.)
   Subdivided into many distinct subordinate parts, which,
   however, not being jointed to the petiole, are not true
   leaflets; -- said of leaves. --Henslow.
   [1913 Webster]