observation height, occlusion, occupy, octahedral, octahedral structure, octahedron, octane number, octet, octet rule, odor, odoriferous, odorless, OES, oil, oil refinery, oily, olefin, oleum, oligomer, OMA, opacity, opalescence, opalescent, opaque, open-hearth furnace, open-hearth process, optical activity, optical conductance, optical emission spectroscopy, optical isomer - Analytical Chemistry (Eng-Ukr) - Іншомовні словники