The Collaborative International Dictionary of English v.0.48:

Trailing \Trail"ing\,
   a. & vb. n. from Trail.
   [1913 Webster]

   Trailing arbutus. (Bot.) See under Arbutus.

   Trailing spring, a spring fixed in the axle box of the
      trailing wheels of a locomotive engine, and so placed as
      to assist in deadening any shock which may occur. --Weale.

   Trailing wheel, a hind wheel of a locomotive when it is not
      a driving wheel; also, one of the hind wheels of a
      carriage.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arbutus \Ar"bu*tus\, Arbute \Ar"bute\, n. [L. arbutus, akin to
   arbor tree.]
   The strawberry tree, a genus of evergreen shrubs, of the
   Heath family. It has a berry externally resembling the
   strawberry; the arbute tree.
   [1913 Webster]

   Trailing arbutus (Bot.), a creeping or trailing plant of
      the Heath family (Epig[ae]a repens), having white or
      usually rose-colored flowers with a delicate fragrance,
      growing in small axillary clusters, and appearing early in
      the spring; in New England known as mayflower; -- called
      also ground laurel. --Gray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

trailing arbutus
    n 1: low-growing evergreen shrub of eastern North America with
         leathery leaves and clusters of fragrant pink or white
         flowers [syn: trailing arbutus, mayflower, Epigaea
         repens]