  A new anticyclic operad Mould is introduced, on spaces of functions in
several variables. It is proved that the Dendriform operad is an anticyclic
suboperad of this operad. Many operations on the free Mould algebra on one
generator are introduced and studied. Under some restrictions, a forgetful map
from moulds to formal vector fields is then defined. A connection to the theory
of tilting modules for quivers of type A is also described.
