Webster's Revised Unabridged Dictionary · 1913

Asteroid

Asteroid ({not transcribed}) , noun

[Greek {not transcribed} starlike, starry; 'asth`r star + e'i^dos form: compare French astéroide. See Aster.]

A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; -- called also planetoids and minor planets.