English
rockproof
From rock + -proof.
Today it means
adj Resistant to damage caused by rocks.
Sources
Sources: Wiktionary, “rockproof”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / rockproof