Source : Webster's Revised Unabridged Dictionary (1913)

Meteoroid \Me"te*or*oid\, n. [Meteor + -oid.] (Astron.)
   A small body moving through space, or revolving about the
   sun, which on entering the earth's atmosphere would be
   deflagrated and appear as a meteor.

         These bodies [small, solid bodies] before they come
         into the air, I call meteoroids.         --H. A.
                                                  Newton.

Source : WordNet®

meteoroid
     n : (astronomy) any of the small solid extraterrestrial bodies
         that hits the earth's atmosphere [syn: {meteor}]