The story
- Proto-Indo-European*gʷelH-
- Proto-Hellenic*gʷəlnō
- Ancient Greekβᾰ́λλω (bắllō)
- Ancient Greekβαλλίστρᾱ (ballístrā)
- Classical Latinballista
- New Latinballisticu
- English todayballistic
Learned borrowing from New Latin ballisticus, from Classical Latin ballista (“ballista, a military siege engine for throwing stones”) + -icus (adjectival suffix). By surface analysis, ballista + -ic.
Etymology from Wiktionary, CC BY-SA 4.0.