\Con*du"pli*cate\, a. [L. conduplicatus, p. p. of
conduplicare. See {Duplicate}.] (Bot.)
Folded lengthwise along the midrib, the upper face being
within; -- said of leaves or petals in vernation or
[ae]stivation.
Biology Dictionary
Definition:
Folded together, with the fold-line along the long axis (e.g. of cotyledons in a seed).
Webster's 1913 Dictionary