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The present study focused on the green synthesis of biocompatible, nano-sized AM-AgNP, from Atalantia monophylla aqueous leaf extract, with significant biomedical applications.Surface Plasmon Resonance (SPR) of AM-AgNP recorded at 396 nm wavelength at an optimum 12 pH and the impeccable intensity of emission peak obtained at 513 nm of PL spectra at 400 nm excitation wavelength, endorsed better synthesis and maximum quantum yield respectively. AM-AgNP atom arrangement exhibited face centred cubic (FCC) type, with an average crystal size of 8.3 nm and when combined, formed a polycrystalline particle size of 11.3 nm, as calculated by Scherer's formula using XRD data, HR-TEM micrograph and SAED pattern respectively. Biocompatible silver nanoparticles have shown selective antimicrobial activity against gram-positive and gram-negative bacterial strains. Green synthesized AM-AgNPs have shown significant in-vitro removal of DPPH and ABTS free radicals compared to aqueous A. monophylla leaf extract and Gallic acid standard. Cell cytotoxicity of AM-AgNP was evaluated against normal (immortal) human embryonic kidney (HEK 293) cell lines and human cervical cancer (HeLa) cell lines that revealed dose dependant, selective cell cytotoxicity besides biocompatible properties.