Dictionary.net

• In bot., curved downwards from the horizontal; bent down on some other part; applied to leaves which are folded longitudinally from apex to base in the bud.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

• Curved downwards from apex to base ; an ovule suspended from a funiculus.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.