Wiktionary
grottoed
a. cavern-like; like a grotto.
Usage examples of "grottoed".
He used his pass to have a swim in one of the grottoed pools the Triangular City maintained for midlevel bureaucrats and followed up with a workout in the gym.
Nils Jensen counted the icebergs, cracked and grottoed or blue-green and crystalline, while Captain Tyler disagreed with Zeke about their route.