only 1 use
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- And plink! a silver drop falls, and the round wrinkles in the glass make all the towers bend and waver like weeds and corals in a grotto of the sea.3.8 — Book 3 Chapter 8 — The Road to Isengard (28% in)
There are no more uses of "grotto" in The Two Towers.
Typical Usage (best examples)