That is, of course, if you really are a relative of Mrs. Epanchin’s, and have not made a little error through—well, absence of mind, which is very common to human beings; or, say—through a too luxuriant fancy?"
There are no more uses of "luxuriant" in the book.
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a luxuriant green valley strewn with violet wildflowers
hunted nearly to extinction for their luxuriant fur