English

antiasteroid

From anti- + asteroid.

Proto-Indo-European *h₂ent- ‘forehead’

Proto-Indo-European *h₂énts ‘forehead’

Proto-Indo-European *h₂énti ‘opposite’

Ancient Greek ᾰ̓ντῐ́ ‘over against, opposite’

English anti-

Ancient Greek ἀστεροειδής ‘starlike’

Today it means

adj Protecting against asteroids.

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

Etymograph / antiasteroid