Resembling or having the characteristics of a comet; comet-like in appearance or behavior.
Constructed from 'comet' plus the Greek '-oid' suffix (meaning 'resembling' or 'form of'). The '-oid' suffix is used across scientific terminology for comet-shaped objects.
The '-oid' suffix lets scientists describe things that aren't quite something but look like it—so a cometoid object is celestially suspect, possibly a comet, possibly not, definitely comet-shaped.
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