Definition of "luxuriant"

She wore a dress of azure blue velvet, with a deep border of gold; her luxuriant hair was put back from her brow in a style which no face but the most perfect could have borne, and was then gathered in a form like that of an ancient helmet, every plait glittering with diamonds: it was peculiar, but it suited her.

1831, L[etitia] E[lizabeth] L[andon], Romance and Reality. […], volume III, London: Henry Colburn and Richard Bentley, […], pages 309–310

Thus, to find luxuriant growths of seaweeds unaffected by man, one must go to the Channel Islands where pollution has not taken its toll.

1966, E. Yale Dawson, Seashore Plants of Southern Califonria, 3rd printing, Berkley: University of California Press, published 1975, page 7