The Collaborative International Dictionary of English v.0.48:

Tallboy \Tall"boy`\, n.
   1. A kind of long-stemmed wineglass or cup.
      [Webster 1913 Suppl.]

   2. A piece of household furniture common in the eighteenth
      century, usually in two separate parts, with larger
      drawers above and smaller ones below and raised on legs
      fifteen inches or more in height; -- called also
      highboy.
      [Webster 1913 Suppl.]

   3. A long sheet-metal pipe for a chimney top.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Highboy \High"boy`\, n.
   1. One who lives high; also, in politics, a highflyer.
      [Webster 1913 Suppl.]

   2. A kind of tall chest of drawers, with drawers up to near
      or above eye level and fouyr legs at the base; it is often
      divided into lower and upper sections, with the lower
      section somewhat wider than the upper; also called a
      tallboy. Compare lowboy. [U. S.] "Mahogany highboys
      glittering with brass handles." --K. L. Bates.
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

tallboy
    n 1: a tall chest of drawers divided into two sections and
         supported on four legs [syn: highboy, tallboy]