The Collaborative International Dictionary of English v.0.48:

Haulm \Haulm\ (h[add]m), n. [OE. halm, AS. healm; akin to D.,
   G., Dan., & Sw. halm, Icel. h[=a]lmr, L. calamus reed, cane,
   stalk, Gr. kalamo`s. Cf. Excel, Culminate, Culm,
   Shawm, Calamus.]
   The denuded stems or stalks of such crops as buckwheat and
   the cereal grains, beans, etc.; straw.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Haulm \Haulm\, n.
   A part of a harness; a hame.
   [1913 Webster]

WordNet (r) 3.0 (2006):

haulm
    n 1: stems of beans and peas and potatoes and grasses
         collectively as used for thatching and bedding [syn:
         haulm, halm]