The Collaborative International Dictionary
planetoids
Asteroid \As"ter*oid\, n. [Gr. ? starlike, starry; 'asth`r star + e'i^dos form: cf. F. ast['e]ro["i]de. 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.
Wiktionary
planetoids
n. (plural of planetoid English)