coadunate

from The Collaborative International Dictionary of English v.0.48

Coadunate \Co*ad"u*nate\ (?; 135), a. [L. coadunatus, p. p. of
   coadunare to unite. See {Adunation}.] (Bot.)
   United at the base, as contiguous lobes of a leaf.
   [1913 Webster]