Definition of cometoid in US English:

cometoid

noun

Astronomy
  • 1D. Kirkwood's name for: a luminous meteor (having an orbit like that of a comet). Now historical and rare.

  • 2Any of various celestial objects resembling a comet or cometary nucleus.

Origin

Early 19th century (in an earlier sense). From comet + -oid.

Pronunciation

cometoid

/ˈkɒmɪtɔɪd/