Organic crystal of 2-aminopyridinium diphenylacetate diphenylaetic acid with dimensions 22 x 13 x 11 mm(3) was grown by slow cooling technique. The structural confirmation has been done using single crystal X-ray diffraction study. The title compound crystallizes in the monoclinic crystal system with noncentrosymmetric space group P2(1). The C-H-O, N-H-O type of packing for the title compound has been reported. Optical transmittance shows a wide transparency in the visible region with lower cutoff wavelength at 349 nm. The four independent tensor coefficients of dielectric permittivity were found to be epsilon(11) = 12.16, epsilon(22) = 10.68, epsilon(33) = 11.90 and epsilon(13) = -4.24 from the dielectric measurements. The thermal stability of the 2APD compound was found to be 128 degrees C assessed by TG-DTA analyses. The particle size SHG of the 2APD reveals that it is a phase-matchable NLO crystal.