The vibrational spectra of supersonically cooled acridine-(H2O)(n) (n = 1-3) clusters in the electronic ground state have been measured by fluorescence-detected infrared spectroscopy. The observed O-H stretching fundamentals of the solvent have been analyzed with the aid of density functional theory calculations, to assign the structures of the clusters. In the It = I cluster, the water molecule acts as a proton donor which is hydrogen-bonded to the N atom of acridine. The second (third) water in the higher clusters is further hydrogen-bonded to the first (second) one to form a linear 'water chain', which surrounds an of the acridine molecule approximately in the plane of the aromatic ring.