\Re*su"pi*nate\, a. [L. resupinatus, p. p. of
resupinare to bend back. See {Resupine}.]
Inverted in position; appearing to be upside down or
reversed, as the flowers of the orchis and the leaves of some
plants.
Biology Dictionary
Definition:
Twisted through 180°, e.g. as with the ovary of most orchids.
Webster's 1913 Dictionary