rupestre
rock
rupture
break or burst
+
-estre
adjective suffix
Rupestre means rock (as an adjective) and can be remembered by thinking of rupture0 (break or burst0), which often happens with rocks, combined with the -estre1 adjective suffix1.
adjective
- rockRelating to or found on rock surfaces, especially prehistoric cave paintings or carvingsEl arte rupestre es una ventana a la vida prehistórica. // Rock art is a window into prehistoric life.