English

interstellar comet

interstellar + comet

Ancient Greek κόμη ‘hair’

Ancient Greek κομήτης ‘longhaired’

Latin comētēs ‘a comet, meteor, shooting star’

Old English comēta

Middle English comete

English comet

Today it means

noun A comet (or exocomet) located in interstellar space, and not gravitationally bound to a star.

Language periods are conventional ranges, not dates for this word.

Etymograph / interstellar comet