The Collaborative International Dictionary of English v.0.48:

Hypodermic needle \Hyp`o*der"mic need"le\, n.
   1. A small slender hollow metallic tube, sharp-pointed at one
      end and fitted at the other end with an adapter of larger
      internal diameter, designed for introduction of liquids
      directly into the bloodstream or other parts of the body
      of an animal.
      [PJC]

   2. a hypodermic needle[1] together with an attached
      syringe.
      [PJC]

WordNet (r) 3.0 (2006):

hypodermic needle
    n 1: a hollow needle